A few years ago, most teams treated \u201cadd an image to a PDF<\/a>\u201d as a basic finishing step\u2014drop a logo on page one, stamp a document once, or attach a signature image at the end. The idea<\/em> was simple, but implementations were often fragile: hard-coded coordinates, no page targeting beyond a single page number, and a workflow <\/a>that assumed you\u2019d always upload files from a server that had the PDF <\/a>sitting on disk.<\/p>\n\n\n\n Today, the way developers use Zoho PDF Editor\u2019s Insert Images in PDF<\/strong> API is more mature. The endpoint is the same concept\u2014overlay images onto an existing PDF\u2014but the playbook<\/strong> has evolved:<\/p>\n\n\n\n This updated article focuses on the most practical part of the endpoint: recipes<\/strong>\u2014repeatable patterns for logos, stamps, signatures, and page-targeted overlays\u2014plus what\u2019s changed from the \u201cbefore\u201d mindset to the \u201ctoday\u201d approach.<\/p>\n\n\n\n The Insert Images endpoint is purpose-built for programmatically overlaying images onto PDFs. In real-world terms, it\u2019s ideal for:<\/p>\n\n\n\n The power isn\u2019t only that it inserts images\u2014it\u2019s that it can do so predictably<\/strong>, at specific locations<\/strong>, on specific pages<\/strong>, at scale<\/strong>.<\/p>\n\n\n\n Before jumping into recipes, it helps to frame the three knobs you\u2019ll use most:<\/p>\n\n\n\n Zoho examples typically use pixel-style values such as Rather than stamping everything everywhere, you can target pages using flexible patterns, including:<\/p>\n\n\n\n If you omit Sometimes the layout shifts between odd and even pages (especially with duplex printing or mirrored margins). This option lets you apply overlays to:<\/p>\n\n\n\n As with Earlier implementations often treated overlaying as a one-off step:<\/p>\n\n\n\n That approach still works for trivial use cases, but it doesn\u2019t age well when your PDFs vary, your templates change, or you need multiple overlays.<\/p>\n\n\n\n Modern usage is more like template automation:<\/p>\n\n\n\n In short: today\u2019s integrations behave more like a pipeline<\/strong> and less like a one-time edit.<\/p>\n\n\n\n This is a common branding pattern: your first few pages are customer-facing, and you want consistent identity without forcing the upstream PDF generator to embed brand assets.<\/p>\n\n\n\n Use \u201cBefore,\u201d teams often hard-coded page 1 only. \u201cToday,\u201d page ranges are the difference between a polished multi-page packet and an inconsistent branded document where only the cover page looks official.<\/p>\n\n\n\n Invoices and statements sometimes alternate layouts per page, especially when the first page is a summary and subsequent pages are line-item detail. If your design expects stamps only on the odd pages (for example, customer-facing pages), parity targeting saves time and prevents layout collisions.<\/p>\n\n\n\n Use Older workflows often duplicated documents or used separate PDF templates to control stamping behavior. Today, parity targeting makes it a single rule\u2014cleaner logic, fewer template variants, fewer edge cases.<\/p>\n\n\n\n Long documents\u2014contracts, agreements, policy packets\u2014often need a visual cue that begins after a certain section. Instead of stamping the whole document (which may be undesirable for signature pages or covers), you can begin stamping at a specific page and continue to the end.<\/p>\n\n\n\n Use the open-ended range In the past, many teams solved this with manual merges or by splitting PDFs. Modern API usage favors rule-driven overlays because it\u2019s more maintainable: if a template grows from 10 pages to 14 pages, the rule still holds.<\/p>\n\n\n\n This recipe matters because it changes your infrastructure needs. If your pipeline receives a PDF URL and an image URL, you can call the API without first downloading files into your own storage.<\/p>\n\n\n\n Earlier integrations assumed a traditional server that stores files locally. Today, many workflows are event-driven and serverless, and URL-based inputs reduce the \u201cdownload \u2192 store \u2192 upload\u201d overhead.<\/p>\n\n\n\n Both PNG and JPEG are supported, but transparency is often the difference between a professional overlay and a clunky one.<\/p>\n\n\n\n JPEG doesn\u2019t support transparency, so it can introduce unwanted background blocks behind your overlay.<\/p>\n\n\n\n Even if your team historically used JPEG \u201cbecause it\u2019s smaller,\u201d modern workflows typically standardize on PNG for overlay assets. The slight increase in size is often worth the visual quality and the flexibility.<\/p>\n\n\n\n A big part of \u201ctoday\u2019s\u201d maturity is designing around documented limits instead of discovering them through failures.<\/p>\n\n\n\n Earlier articles often glossed over limits, treating them as edge cases. In production, limits are architecture constraints. Modern teams build validation at the edges:<\/p>\n\n\n\n If you truly need more than 10 overlays:<\/p>\n\n\n\n This chained approach is the \u201ctoday\u201d solution\u2014predictable, modular, and easier to troubleshoot than a single mega-request that fails halfway through.<\/p>\n\n\n\n Many document workflows don\u2019t end at \u201cdownload the PDF.\u201d They end at \u201cstore it where the business can find it, share it, audit it, and retain it.\u201d<\/p>\n\n\n\n Instead of using the standard insert-and-download flow, you use the \u201cBefore,\u201d teams typically handled storage themselves: download the output, then upload it to a drive, bucket, or document system. \u201cToday,\u201d direct storage reduces integration complexity:<\/p>\n\n\n\n If you want your integration to feel modern and resilient, combine the recipes into a simple overlay pipeline:<\/p>\n\n\n\n That structure is the real \u201ctoday\u201d upgrade: your integration becomes a predictable sequence of small, testable operations instead of one brittle call.<\/p>\n\n\n\n Modern teams serialize JSON from objects (in their language of choice) instead of manually building strings. This prevents broken quotes, missing braces, and malformed payloads.<\/p>\n\n\n\n If you calibrate Leaving out Because processing is job-based, your pipeline must handle polling, retries, and timeouts. Today\u2019s approach is to implement this as a background worker or queue task rather than blocking a user request.<\/p>\n\n\n\n The Insert Images API has always been about placing images onto PDFs. What\u2019s changed is how teams think about it. The \u201cbefore\u201d mindset was manual replacement: \u201cHow do I mimic what a person does in an editor?\u201d The \u201ctoday\u201d mindset is workflow automation: \u201cHow do I apply repeatable placement rules across many PDFs, reliably, with clean storage and scalable inputs?\u201d<\/p>\n\n\n\n If you adopt the recipes above\u2014logo ranges, odd\/even stamping, onward ranges, URL-based inputs, PNG transparency, limit-aware chaining, and WorkDrive storage\u2014you end up with an integration that feels like a real document pipeline, not a fragile script.<\/p>\n\n\n\n If you paste your exact use case (invoice, contract, report, packet) and where you want the overlay placed (top-left header, center stamp, signature block, etc.), I can translate these recipes into a single cohesive \u00a9 Image credits to Steve Johnson<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\n
What the Insert Images endpoint is best at<\/h2>\n\n\n\n
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How the control knobs work:
input_options<\/code>, page_ranges<\/code>, and odd_or_even_pages<\/code><\/h2>\n\n\n\nimage_rect<\/code>: position and size as a rectangle<\/h3>\n\n\n\nimage_rect<\/code> is where you define where the image goes and how big it is<\/em>. It uses rectangle-style properties:<\/p>\n\n\n\n\n
top<\/code><\/li>\n\n\n\nleft<\/code><\/li>\n\n\n\nwidth<\/code><\/li>\n\n\n\nheight<\/code><\/li>\n<\/ul>\n\n\n\n\"25px\"<\/code>, which makes it straightforward to treat placement like a layout coordinate system. The most important takeaway: once you calibrate these values for a template, you get repeatable placement across documents of the same format.<\/p>\n\n\n\npage_ranges<\/code>: control which pages receive the image<\/h3>\n\n\n\n\n
\"1,2,5\"<\/code> (specific pages)<\/li>\n\n\n\n\"2-4,7-9\"<\/code> (multiple ranges)<\/li>\n\n\n\n\"-5\"<\/code> (from the first page through page 5)<\/li>\n\n\n\n\"7-\"<\/code> (from page 7 through the last page)<\/li>\n<\/ul>\n\n\n\npage_ranges<\/code> (or pass it empty), the default behavior is typically to apply the overlay across all pages\u2014useful for watermarks, but risky if you only meant page one.<\/p>\n\n\n\nodd_or_even_pages<\/code>: target by page parity<\/h3>\n\n\n\n\n
\"odd\"<\/code> pages only<\/li>\n\n\n\n\"even\"<\/code> pages only<\/li>\n<\/ul>\n\n\n\npage_ranges<\/code>, leaving this blank generally results in \u201call pages,\u201d so you should set it intentionally when parity matters.<\/p>\n\n\n\nThe \u201cbefore vs. today\u201d shift in everyday usage<\/h2>\n\n\n\n
Before: single placement thinking<\/h3>\n\n\n\n
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Today: rule-driven placement<\/h3>\n\n\n\n
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Recipe 1: Put a business logo on the top-left of pages 1\u20133<\/h2>\n\n\n\n
How it works<\/h3>\n\n\n\n
image_rect<\/code> to define the logo\u2019s location and size, and page_ranges<\/code> to apply it to pages 1 through 3.<\/p>\n\n\n\n{\n \"image_rect\": { \"top\": \"25px\", \"left\": \"25px\", \"width\": \"140px\", \"height\": \"40px\" },\n \"page_ranges\": \"1-3\"\n}\n<\/code><\/pre>\n\n\n\nWhy this recipe matters more today<\/h3>\n\n\n\n
Practical tips<\/h3>\n\n\n\n
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top<\/code> across representative samples.<\/li>\n\n\n\nRecipe 2: Stamp only odd pages as \u201cPAID\u201d<\/h2>\n\n\n\n
How it works<\/h3>\n\n\n\n
odd_or_even_pages: \"odd\"<\/code> with a stamp-sized rectangle.<\/p>\n\n\n\n{\n \"image_rect\": { \"top\": \"120px\", \"left\": \"320px\", \"width\": \"220px\", \"height\": \"220px\" },\n \"odd_or_even_pages\": \"odd\"\n}\n<\/code><\/pre>\n\n\n\nWhat changed from before to today<\/h3>\n\n\n\n
Practical tips<\/h3>\n\n\n\n
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page_ranges<\/code>, remember you\u2019re effectively combining filters (only pages in the range and<\/em> matching odd\/even).<\/li>\n<\/ul>\n\n\n\nRecipe 3: Apply a marker from page 7 onward<\/h2>\n\n\n\n
How it works<\/h3>\n\n\n\n
\"7-\"<\/code>.<\/p>\n\n\n\n{\n \"image_rect\": { \"top\": \"25px\", \"left\": \"25px\", \"width\": \"120px\", \"height\": \"120px\" },\n \"page_ranges\": \"7-\"\n}\n<\/code><\/pre>\n\n\n\nWhy this is a \u201ctoday\u201d pattern<\/h3>\n\n\n\n
Practical tips<\/h3>\n\n\n\n
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Recipe 4: Insert images using public URLs (no file upload required)<\/h2>\n\n\n\n
How it works<\/h3>\n\n\n\n
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file<\/code> parameter.<\/li>\n\n\n\nimage_files<\/code>.<\/li>\n<\/ul>\n\n\n\nWhat changed from before to today<\/h3>\n\n\n\n
Practical tips<\/h3>\n\n\n\n
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Recipe 5: Use PNG when you need transparency<\/h2>\n\n\n\n
When PNG is the better choice<\/h3>\n\n\n\n
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Today\u2019s best practice<\/h3>\n\n\n\n
Recipe 6: Stay within platform bounds to prevent job failure<\/h2>\n\n\n\n
Key bounds to respect<\/h3>\n\n\n\n
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What changed from before to today<\/h3>\n\n\n\n
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How to handle \u201cmore than 10 images\u201d<\/h3>\n\n\n\n
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Recipe 7: Store the result directly in WorkDrive (optional but increasingly common)<\/h2>\n\n\n\n
How it works conceptually<\/h3>\n\n\n\n
addimages\/store<\/code> variant to save the output directly to WorkDrive.<\/p>\n\n\n\nWhat changed from before to today<\/h3>\n\n\n\n
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Practical tips<\/h3>\n\n\n\n
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Putting it all together: a \u201ctoday-style\u201d overlay strategy<\/h2>\n\n\n\n
Step 1: Branding layer<\/h3>\n\n\n\n
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Step 2: Status stamping layer<\/h3>\n\n\n\n
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Step 3: Document control layer<\/h3>\n\n\n\n
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Step 4: Asset strategy<\/h3>\n\n\n\n
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Step 5: Delivery strategy<\/h3>\n\n\n\n
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Step 6: Guardrails<\/h3>\n\n\n\n
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Common mistakes that still show up (and how \u201ctoday\u201d teams avoid them)<\/h2>\n\n\n\n
Incorrect JSON formatting in
input_options<\/code><\/h3>\n\n\n\nCoordinates calibrated on one PDF only<\/h3>\n\n\n\n
image_rect<\/code> on a single example PDF, you risk misalignment across variants. Today\u2019s best practice is to calibrate per template family and store the coordinates in configuration.<\/p>\n\n\n\nForgetting defaults apply to all pages<\/h3>\n\n\n\n
page_ranges<\/code> or odd_or_even_pages<\/code> can unintentionally stamp every page. Modern implementations treat page targeting as explicit configuration, not an optional afterthought.<\/p>\n\n\n\nOverlooking the asynchronous nature of the job<\/h3>\n\n\n\n
Conclusion: the endpoint didn\u2019t just add features\u2014teams changed how they use it<\/h2>\n\n\n\n
input_options<\/code> design and a practical multi-step plan that respects the 10-image constraint without complicating your system.<\/p>\n\n\n\n