katlab

PDF tools

Merge, split, compress, sign, fill, protect, convert and check PDFs. Every tool runs in your browser, so your documents never leave your device.

No uploads · no accounts · no tracking

Merge, split & organise

Merge & Split PDF
Merge PDFs into one or split out pages — locally, no upload.
Organize PDF
Preview, rotate, delete & reorder PDF pages — locally, no upload.
Add Page Numbers to PDF
Page X of Y, skip the cover, Bates across files — locally, no upload.
Watermark PDF
CONFIDENTIAL, DRAFT, a logo or one copy per recipient — locally, no upload.

Make smaller or protect

Compress PDF
Shrink scanned & image-heavy PDFs 4–10× — locally, no upload.
Protect PDF
Add an AES-256 password & restrict printing or copying — locally, no upload.
Unlock PDF
Remove PDF restrictions & known open passwords — locally, no upload.

Sign, fill & mark up

Sign PDF
Draw, type or upload a signature & place it on any page — locally, no upload.
Fill PDF Form
Type into fillable PDF forms & save your answers — locally, no upload.
Annotate PDF
Fill forms, draw, highlight, sign & truly redact PDFs — locally, no upload.

Convert to and from PDF

Images to PDF
Combine JPG, PNG & WebP into a single PDF — locally, no upload.
PDF to JPG
Convert PDF pages to JPG or PNG images — locally, no upload.
PDF to PowerPoint
Every PDF page becomes a PPTX slide, pixel-perfect — locally, no upload.
PDF to Markdown
Turn a PDF into clean Markdown with headings & lists — locally, no upload.
Markdown to PDF
Polished PDFs from Markdown with themes, code & math — no watermark, no upload.
OCR PDF
Make scanned PDFs and photos searchable, 12 languages — locally, no upload.

Check & compare

Check a PDF
Spot edits, painted-over text, changes after signing and fake links — locally, no upload.
Compare PDF
Every changed word between two PDFs, plus earlier saved versions — locally, no upload.
Metadata Remover
Remove author, company, comment names & photo GPS from PDF, Word, Excel & PowerPoint — no upload.

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