{"id":9797,"date":"2026-01-03T08:11:58","date_gmt":"2026-01-03T07:11:58","guid":{"rendered":"https:\/\/scalarly.com\/marketing-book\/?p=9797"},"modified":"2026-01-03T08:15:43","modified_gmt":"2026-01-03T07:15:43","slug":"from-manual-overlays-to-automated-stamps-the-2026-guide-to-zoho-pdf-editors-addimages-api-no-link-edition","status":"publish","type":"post","link":"https:\/\/scalarly.com\/marketing-book\/from-manual-overlays-to-automated-stamps-the-2026-guide-to-zoho-pdf-editors-addimages-api-no-link-edition\/","title":{"rendered":"From Manual Overlays to Automated Stamps: The 2026 Guide to Zoho PDF Editor\u2019s addimages API (No-Link Edition)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Why the <code>addimages<\/code> API matters now<\/h2>\n\n\n\n<p class=\"has-drop-cap\">Adding a logo, \u201cPAID\u201d stamp, signature image, <a href=\"https:\/\/scalarly.com\/marketing-book\/zoho-writer-unlocking-document-automation-with-qr-codes-smart-lists-and-dynamic-watermarks\/\" target=\"_blank\" rel=\"noreferrer noopener\">watermark badge<\/a>, or compliance mark to a PDF used to be a repetitive manual step: open a PDF editor, place an image, resize it, export, and repeat for every document. The <a href=\"https:\/\/scalarly.com\/marketing-book\/it\/modificare-pdf-gratis-online-con-zoho-pdf-editor-nessuna-installazione-necessaria\/\" target=\"_blank\" rel=\"noreferrer noopener\">Zoho PDF Editor API<\/a> changes that workflow by letting your application insert images into an existing PDF programmatically\u2014so your system can brand invoices, stamp receipts, or apply signatures automatically, without human editing.<\/p>\n\n\n\n<p>That <a href=\"https:\/\/scalarly.com\/marketing-book\/the-future-of-document-automation-zoho-writers-2025-breakthroughs\/\" target=\"_blank\" rel=\"noreferrer noopener\">automation <\/a>is especially valuable when PDFs are generated at scale (invoicing, onboarding packets, shipping labels, legal exhibits, reports). Instead of pushing PDFs through a manual queue, you can treat image overlays as a predictable post-processing step: generate PDF \u2192 call <code>addimages<\/code> \u2192 deliver the updated PDF.<\/p>\n\n\n\n<p>This updated article explains how the <code>addimages<\/code> endpoint works today, what details are clearer in current documentation, and how to implement it reliably in real-world pipelines.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What has changed from \u201cbefore\u201d to \u201ctoday\u201d<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">The image limits are now clearer and easier to implement correctly<\/h3>\n\n\n\n<p>Earlier drafts and informal summaries sometimes described the endpoint as inserting \u201cten or more\u201d images. Today\u2019s documentation makes the limit unambiguous: you can insert <strong>up to 10 images per request<\/strong>, with a maximum of <strong>10 MB per image<\/strong>, using <strong>PNG or JPEG<\/strong>.<\/p>\n\n\n\n<p>This change matters because limits shape architecture. If you need to place more than 10 images (for example, a multi-page package with multiple stamps per page), you\u2019ll need to split the work into multiple API calls or rethink placement rules so fewer unique images are used.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Domain selection is treated as a real deployment requirement, not a footnote<\/h3>\n\n\n\n<p>Implementations used to fail because developers hard-coded a single base domain and later discovered their Zoho account lived in a different data center. Current guidance emphasizes that your API base domain must match your account\u2019s data center (US, EU, IN, and others). In practice, \u201cworks on my machine\u201d becomes \u201cworks everywhere\u201d only when your code makes the domain configurable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Placement rules (<code>input_options<\/code>) are now better understood as a structured model<\/h3>\n\n\n\n<p>The biggest source of errors isn\u2019t authentication\u2014it\u2019s formatting <code>input_options<\/code>. Today it\u2019s much clearer that placement instructions are a structured payload describing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Where<\/strong> the image goes (rectangle coordinates and size)<\/li>\n\n\n\n<li><strong>Which pages<\/strong> get it (page ranges)<\/li>\n\n\n\n<li><strong>Whether page parity matters<\/strong> (odd\/even filtering)<\/li>\n<\/ul>\n\n\n\n<p>This makes the endpoint more flexible than many first-time users assume. You\u2019re not limited to \u201cone image, one page.\u201d You can define repeatable rules that apply across multiple pages without repeating the same instructions manually.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Storage workflows are more prominent in modern usage<\/h3>\n\n\n\n<p>Many teams no longer want \u201cdownload and then store somewhere else\u201d as a separate step. The WorkDrive storage variant (the <code>\/store<\/code> path) supports workflows where the API saves the result into a managed repository. That\u2019s a meaningful shift in \u201ctoday\u2019s\u201d best practice: fewer moving parts, clearer ownership, and better auditability\u2014especially for organizations that already use WorkDrive.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What the Insert Images endpoint does<\/h2>\n\n\n\n<p>The <strong>Insert Images in PDF<\/strong> endpoint is built for overlaying images onto an existing PDF. Your request includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A PDF input (uploaded file or a publicly accessible URL)<\/li>\n\n\n\n<li>One or more images (uploaded files or publicly accessible URLs)<\/li>\n\n\n\n<li>Output settings (such as the modified file name)<\/li>\n\n\n\n<li>Placement settings (<code>input_options<\/code>) that define where the images appear and which pages they apply to<\/li>\n<\/ul>\n\n\n\n<p>Key constraints you should design around:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Input PDF size<\/strong>: up to <strong>50 MB<\/strong><\/li>\n\n\n\n<li><strong>Images per request<\/strong>: up to <strong>10<\/strong><\/li>\n\n\n\n<li><strong>Image formats<\/strong>: <strong>PNG<\/strong> and <strong>JPEG<\/strong><\/li>\n\n\n\n<li><strong>Image size<\/strong>: up to <strong>10 MB<\/strong> per image<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Requirements before you call the API<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Choose the correct data-center domain<\/h3>\n\n\n\n<p>Zoho APIs are domain-specific by data center. Your <code>addimages<\/code> request must go to the correct base domain for your Zoho account. Treat this as configuration, not a constant.<\/p>\n\n\n\n<p>A practical recommendation: store the base domain as an environment variable (or tenant setting if you support multiple Zoho accounts). That way you can switch domains without code changes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Create an OAuth access token with the right scope<\/h3>\n\n\n\n<p>Your OAuth token must include the scope:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ZohoWriter.pdfEditor.ALL<\/code><\/li>\n<\/ul>\n\n\n\n<p>If you use the WorkDrive storage endpoint, you\u2019ll also need the relevant WorkDrive scopes, and the account you\u2019re using must have WorkDrive available.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Endpoint you\u2019ll call<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Insert images and download later<\/h3>\n\n\n\n<p>Use a POST request to the <code>addimages<\/code> path:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/pdfeditor\/api\/v1\/pdf\/addimages\n<\/code><\/pre>\n\n\n\n<p>Prepend the correct base domain for your data center.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Insert images and store in WorkDrive<\/h3>\n\n\n\n<p>Use a POST request to the <code>addimages\/store<\/code> path:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/pdfeditor\/api\/v1\/pdf\/addimages\/store\n<\/code><\/pre>\n\n\n\n<p>This path is designed for storing the final PDF in WorkDrive (rather than only returning a download flow).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How the request body works (multipart\/form-data)<\/h2>\n\n\n\n<p>The API expects <strong>multipart\/form-data<\/strong>, typically with four key parts: <code>file<\/code>, <code>image_files<\/code>, <code>output_settings<\/code>, and <code>input_options<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PDF input: <code>file<\/code><\/h3>\n\n\n\n<p>You can provide the PDF in either of two ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Upload the PDF file as a binary form part<\/li>\n\n\n\n<li>Provide a <strong>publicly accessible PDF URL<\/strong> as a string<\/li>\n<\/ul>\n\n\n\n<p>The \u201cURL input\u201d approach is useful when the PDF already lives in a location accessible to Zoho\u2019s servers, and you want to avoid downloading and re-uploading it in your own infrastructure. The \u201cfile upload\u201d approach is safer when your PDFs are private, generated on the fly, or gated behind authentication.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Image input: <code>image_files<\/code><\/h3>\n\n\n\n<p>You can provide images in either of two ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Upload one or more image files as binary form parts<\/li>\n\n\n\n<li>Provide <strong>public image URLs<\/strong> as a comma-separated string<\/li>\n<\/ul>\n\n\n\n<p>This flexibility makes it easy to support both \u201clocal file pipeline\u201d workflows and \u201ccloud-hosted asset\u201d workflows. For example, you might store logos and stamps in object storage and pass them by URL, while uploading PDFs generated dynamically by your app.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Output name: <code>output_settings<\/code><\/h3>\n\n\n\n<p>This parameter is a JSON string that defines the output file name:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{ \"name\": \"ModifiedFile.pdf\" }\n<\/code><\/pre>\n\n\n\n<p>When using the WorkDrive storage variant, output settings can also control storage behavior, such as where to place the file and whether to overwrite an existing file (depending on your chosen WorkDrive configuration).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Placement rules: <code>input_options<\/code><\/h3>\n\n\n\n<p>This is the most important parameter because it controls where images go.<\/p>\n\n\n\n<p>The payload lets you define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>image_rect<\/code>: the rectangle for placement and size (top, left, width, height)<\/li>\n\n\n\n<li><code>page_ranges<\/code> (optional): which pages receive the image<\/li>\n\n\n\n<li><code>odd_or_even_pages<\/code> (optional): apply only to odd or even pages<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Understanding <code>image_rect<\/code><\/h4>\n\n\n\n<p>You\u2019ll define the placement rectangle using properties like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>top<\/code><\/li>\n\n\n\n<li><code>left<\/code><\/li>\n\n\n\n<li><code>width<\/code><\/li>\n\n\n\n<li><code>height<\/code><\/li>\n<\/ul>\n\n\n\n<p>Zoho examples commonly use pixel-style strings like <code>\"25px\"<\/code>. The key takeaway is that placement is deterministic once you\u2019ve calibrated the coordinates for your PDF template.<\/p>\n\n\n\n<p>If your PDFs aren\u2019t consistent (different page sizes, varying margins, mixed templates), you may need to segment your workflow by template type and apply different rectangles per template.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Using <code>page_ranges<\/code><\/h4>\n\n\n\n<p>Page selection can be expressed in several patterns:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\"1,2,5\"<\/code> for specific pages<\/li>\n\n\n\n<li><code>\"2-4,7-9\"<\/code> for multiple ranges<\/li>\n\n\n\n<li><code>\"-5\"<\/code> for \u201cfrom the first page through page 5\u201d<\/li>\n\n\n\n<li><code>\"7-\"<\/code> for \u201cfrom page 7 through the last page\u201d<\/li>\n<\/ul>\n\n\n\n<p>If <code>page_ranges<\/code> is omitted or empty, the placement defaults to all pages.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Using <code>odd_or_even_pages<\/code><\/h4>\n\n\n\n<p>You can restrict placement to odd pages or even pages. This is especially useful when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your PDFs print double-sided and margins differ by side<\/li>\n\n\n\n<li>You want stamps only on customer-facing pages<\/li>\n\n\n\n<li>Your document layout alternates positions across pages<\/li>\n<\/ul>\n\n\n\n<p>If <code>odd_or_even_pages<\/code> is omitted or empty, placement defaults to all pages.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A clean curl example (with correct structure)<\/h2>\n\n\n\n<p>Below is a corrected, readable curl example that matches the required multipart parts. Replace the token value and file paths with your own.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>curl --location --request POST \"&lt;BASE_DOMAIN&gt;\/pdfeditor\/api\/v1\/pdf\/addimages\" \\\n  --header \"Authorization: Zoho-oauthtoken &lt;ACCESS_TOKEN&gt;\" \\\n  --form 'file=@\"\/path\/to\/Sample.pdf\"' \\\n  --form 'image_files=@\"\/path\/to\/img.png\"' \\\n  --form 'output_settings={\"name\":\"ModifiedFile.pdf\"}' \\\n  --form 'input_options={\"image_rect\":{\"top\":\"25px\",\"left\":\"25px\",\"width\":\"200px\",\"height\":\"200px\"}}'\n<\/code><\/pre>\n\n\n\n<p>A common mistake in older examples is broken quoting around JSON strings or mixing up where <code>output_settings<\/code> and <code>input_options<\/code> belong. Keep each JSON value as a single, valid JSON string inside its corresponding form part.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding the asynchronous response workflow<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">The job-based response model<\/h3>\n\n\n\n<p>The <code>addimages<\/code> endpoint returns an asynchronous job rather than immediately returning the final PDF. That means your application should:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Submit the request<\/li>\n\n\n\n<li>Receive a response containing a status check URL and an \u201cin progress\u201d status<\/li>\n\n\n\n<li>Poll the status URL until the job completes<\/li>\n\n\n\n<li>Retrieve the final PDF using the provided download URL template when the status becomes \u201csuccess\u201d<\/li>\n<\/ol>\n\n\n\n<p>This approach is common for PDF processing APIs because the output time depends on file size, page count, and the number of image operations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Designing a robust polling strategy<\/h3>\n\n\n\n<p>To avoid rate limits and reduce unnecessary traffic:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use an increasing backoff between polls (for example, 1s \u2192 2s \u2192 4s \u2192 8s)<\/li>\n\n\n\n<li>Stop polling after a reasonable timeout and surface a clear error to your user\/system<\/li>\n\n\n\n<li>Log the job ID and status check URL for diagnostics<\/li>\n<\/ul>\n\n\n\n<p>If your architecture supports background workers, this is an ideal job for a queue: submit \u2192 enqueue polling task \u2192 complete \u2192 store output.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Real-world use cases that benefit from <code>addimages<\/code><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Branding outgoing documents<\/h3>\n\n\n\n<p>Many teams use <code>addimages<\/code> to apply a consistent logo to PDFs generated by different systems. This is especially useful when the upstream generator can\u2019t embed brand assets cleanly or when you need to add branding after the fact.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Adding signatures and stamps<\/h3>\n\n\n\n<p>If you capture signatures as images (for example, a signed consent captured on a tablet), <code>addimages<\/code> can embed that signature at the correct position on the signature page. Stamps like \u201cAPPROVED,\u201d \u201cPAID,\u201d \u201cCONFIDENTIAL,\u201d or \u201cDRAFT\u201d are also common.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Compliance overlays and audit marks<\/h3>\n\n\n\n<p>Organizations in regulated industries often add compliance marks or document control badges. Using placement rules plus page targeting, you can apply these consistently across standard forms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Template-based PDF pipelines<\/h3>\n\n\n\n<p>If you have a set of known templates (invoice template A, invoice template B, contract template C), you can store placement rectangles per template and apply them deterministically. That\u2019s where <code>addimages<\/code> becomes \u201cset and forget.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Troubleshooting: quick checks that resolve most errors<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Size and format constraints<\/h3>\n\n\n\n<p>Start by confirming:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PDF is not larger than 50 MB<\/li>\n\n\n\n<li>You\u2019re inserting no more than 10 images<\/li>\n\n\n\n<li>Each image is \u2264 10 MB<\/li>\n\n\n\n<li>Images are PNG or JPEG<\/li>\n<\/ul>\n\n\n\n<p>When your system scales, these constraints should be validated before you call the API so failures are predictable and user-facing messages are clear.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Token problems (401 Unauthorized)<\/h3>\n\n\n\n<p>If you receive an authorization error, check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The token is not expired<\/li>\n\n\n\n<li>The token includes <code>ZohoWriter.pdfEditor.ALL<\/code><\/li>\n\n\n\n<li>You\u2019re calling the correct data-center domain for the account<\/li>\n<\/ul>\n\n\n\n<p>For the <code>\/store<\/code> endpoint, confirm WorkDrive scopes and WorkDrive availability as well.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bad request formatting (400 Bad Request)<\/h3>\n\n\n\n<p>Most formatting issues come from JSON strings:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>output_settings<\/code> must be valid JSON<\/li>\n\n\n\n<li><code>input_options<\/code> must be valid JSON<\/li>\n\n\n\n<li>Quotes inside JSON must be properly escaped depending on your HTTP client<\/li>\n\n\n\n<li>Your multipart boundary must be correct (most libraries handle this automatically)<\/li>\n<\/ul>\n\n\n\n<p>If you\u2019re using a server-side language, prefer a mature multipart library and build the JSON using native objects \u2192 JSON serialization, rather than manual string concatenation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Best practices for production reliability<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Validate inputs before calling the API<\/h3>\n\n\n\n<p>Build a validation layer that checks file size, image count, and format. This saves time and reduces API calls that are guaranteed to fail.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Treat placement as a template calibration step<\/h3>\n\n\n\n<p>Even with correct rectangles, placement quality depends on page size and layout consistency. Run a calibration pass:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Choose a representative PDF for each template<\/li>\n\n\n\n<li>Test placement with your chosen rectangles<\/li>\n\n\n\n<li>Adjust until the overlay is consistent<\/li>\n\n\n\n<li>Store those rectangles in configuration (not hard-coded in source)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Make the base domain configurable<\/h3>\n\n\n\n<p>If you support multiple Zoho accounts (or you might migrate between data centers), keep the base domain in configuration. This prevents brittle deployments and makes your integration portable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Choose download vs. store early<\/h3>\n\n\n\n<p>If your system needs to immediately deliver a PDF to the end user, the standard job + download flow is straightforward. If you need retention and centralized access, the WorkDrive storage flow can simplify your downstream steps. The key is to pick the approach that matches your business process, not just the one that seems easiest in a quick test.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>The Zoho PDF Editor <code>addimages<\/code> API is a practical way to automate one of the most common \u201clast-mile\u201d PDF tasks: placing images onto an existing PDF with consistent positioning and predictable page rules. The modern documentation makes today\u2019s limits and structure clearer\u2014especially around the maximum of 10 images per request, supported image types, file size constraints, domain-specific endpoints, and the structured <code>input_options<\/code> model for page targeting and placement.<\/p>\n\n\n\n<p>If you\u2019d like, paste your current <code>input_options<\/code> JSON (with your intended placement goal\u2014logo, signature, stamp, etc.), and I\u2019ll rewrite it into a clean, validated payload you can drop into your code without quoting errors.<\/p>\n\n\n\n<p class=\"has-small-font-size\">\u00a9 Image credits to <a href=\"https:\/\/www.pexels.com\/@steve\/\" target=\"_blank\" rel=\"noreferrer noopener\">Steve Johnson<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why the addimages API matters now Adding a logo, \u201cPAID\u201d stamp, signature image, watermark badge, or compliance mark to a PDF used to be a repetitive manual step: open a PDF editor, place an image, resize it, export, and repeat for every document. The Zoho PDF Editor API changes that workflow by letting your application insert images into an existing..<\/p>\n<a class=\"read-more-link\" href=\" https:\/\/scalarly.com\/marketing-book\/from-manual-overlays-to-automated-stamps-the-2026-guide-to-zoho-pdf-editors-addimages-api-no-link-edition\/ \">Read more<\/a>","protected":false},"author":1,"featured_media":9798,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2219],"tags":[],"class_list":["post-9797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-crm"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>From Manual Overlays to Automated Stamps: The 2026 Guide to Zoho PDF Editor\u2019s addimages API (No-Link Edition) &#187; Little Marketing 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