Free Online PDF Editor — What PDFslime Can and Can't Do
Quick answer: PDFslime is a free, browser-based toolkit for the PDF tasks people run into most: merging, splitting, rotating, page numbers, compression, password protection, unlocking, OCR, and image conversion. It doesn't do in-place text editing or form filling — here's exactly where the line is.
"PDF editor" gets used to describe everything from a full desktop app that lets you rewrite paragraphs, to a lightweight tool that just reorders pages. PDFslime is the second kind — call it a PDF studio, not a word processor for PDFs — and it's worth knowing exactly what that covers before you go looking for it.
What PDFslime Handles
Merge & Split
Combine files, extract ranges, or split into single pages.
Rotate & Page numbers
Fix orientation and stamp numbering across a document.
Compress
Shrink file size for email or upload limits.
Protect & Unlock
Add or remove password encryption.
OCR
Make scans searchable, or extract their text.
Image ↔ PDF
Turn photos into a PDF, or export pages as images.
Every one of these runs entirely in your browser using open-source libraries (pdf-lib, pdf.js, Tesseract.js) — nothing is uploaded to a server.
What It Doesn't Do
- Rewriting body text — click-to-edit paragraphs isn't supported. Edit the source document (Word, Google Docs) and re-export instead.
- Filling PDF form fields — not currently available.
- Watermarking, redaction, or metadata scrubbing — also not built in yet; see our guides on watermarks, redaction, and metadata for honest alternatives.
Why Client-Side Instead of "Full" Editing
Full in-browser text editing of arbitrary PDFs is a genuinely hard problem — PDF text isn't stored as clean, reflowable paragraphs, so editing it reliably usually needs either the original source file or heavier desktop software. PDFslime focuses on the operations that work reliably and privately in a browser, rather than approximating a feature that would be fragile or misleading.
Frequently Asked Questions
Yes — every tool is free, with no sign-up and no watermarking of your output.
No — it runs in any modern browser, desktop or mobile.
It's not part of the current toolset. For now, the guides linked above cover the best honest workarounds for the features PDFslime doesn't have yet.