Edit PDF
Add custom text and images anywhere on any PDF page — ship multiple overlays in a single batch.
- Encrypted in transit (TLS 1.3)
- Files auto-deleted in 60 minutes
- No signup required
Run Edit PDF
About Edit PDF
Edit PDF is Pixenith's power-user overlay endpoint: ship a list of text and image edits (with X/Y coordinates, sizes and page numbers) and we'll bake them all onto your PDF in one pass. Perfect for invoice generators, certificate factories and automated branding pipelines.
For point-and-click editing, use the dedicated single-purpose tools (Add Watermark, Add Page Numbers, Sign PDF, Add Signature Image). For programmatic batch overlays, this is the endpoint to call.
How Edit PDF works
Three steps. Done in seconds.
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1
Upload your PDF
Any PDF you want to overlay.
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2
Ship your edits as JSON
Pass an ``edits`` array in the Advanced JSON — each entry specifies page, kind (text|image), x, y, content.
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3
Download the edited PDF
All overlays applied in one pass. Original is auto-deleted in 60 minutes.
Why Edit PDF on Pixenith
Built for serious work. Free for everyday use.
Privacy first
Encrypted in transit, processed in isolated workers, deleted within 60 minutes.
Lightning fast
Most jobs finish in under 5 seconds. Heavy ones run on dedicated worker pools.
Production engine
Powered by pikepdf, Ghostscript, Tesseract OCR, ONNX models — the same tech the pros use.
Free, no signup
Generous daily limits on the free plan. Upgrade only if you need bigger files.
Related PDF tools
Often used alongside Edit PDF.
- Add watermark Stamp a text watermark across every page.
- Add page numbers Insert page numbers at the position and format of your choice.
- PDF forms Fill in the form fields of a fillable PDF.
- Sign PDF Digitally sign a PDF with a PKCS#12 certificate.
- Merge PDF Combine multiple PDFs into a single document in the order you choose.
- Rotate PDF Rotate every page or a specific range by 90/180/270 degrees.
Edit PDF — frequently asked questions
Everything you need to know.
Why is this tool JSON-only?
Arbitrary overlay placement is a multi-dimensional problem (page, position, kind, content, size) that doesn't fit a simple form. For one-off edits, use Add Watermark, Add Page Numbers or Sign PDF instead.
What does an edits entry look like?
Text: ``{"page":1, "kind":"text", "x":36, "y":700, "text":"Approved", "size":14}``. Image: ``{"page":1, "kind":"image", "x":400, "y":50, "image_b64":"<base64>", "width":120, "height":40}``.
What coordinate system do you use?
Standard PDF: origin at bottom-left, units in points (72 pt = 1 inch). A US Letter page is 612 x 792 points.
Can the overlay be transparent / semi-transparent?
Current endpoint draws solid Helvetica text and full-opacity images. For semi-transparent watermark stamps, use the dedicated Watermark PDF tool.
Is there a limit on number of edits per call?
Practical limit ~500 edits per call. Beyond that, contact us about the batch API for the Business plan.