PDF and spreadsheet tools that never upload your files
Sign a contract, fill in a form, black out an account number for real, then merge, split or compress the result. Convert CSV, Excel and JSON too. Every tool runs in your browser tab, so your documents stay on your device.
- Files never leave your device
- 22 free tools
- No sign-up, no watermark
PDF tools
Sign PDF
Draw, type or upload your signature, add the date and initials, and place them on any page.
Fill PDF form
Fill in PDF form fields or type onto any PDF, then download it, optionally flattened.
Redact PDF
Black out emails, phone and card numbers for real: the hidden text is removed, then checked.
Merge PDF
Combine several PDFs into one file, in the order you choose.
Split PDF
Cut a PDF into parts by page ranges, every N pages or every page.
Rotate PDF
Turn individual pages or the whole document, then save a new PDF.
Reorder & delete pages
Drag pages into a new order and remove the ones you do not need.
Extract pages
Pull selected pages out of a PDF into a new, smaller file.
Images to PDF
Turn JPG and PNG photos or scans into one PDF, one image per page.
PDF to images
Render PDF pages as PNG or JPG pictures and download them as a ZIP.
Add page numbers
Stamp page numbers on every page, with custom position and format.
Watermark PDF
Stamp text such as CONFIDENTIAL across every page.
Compress PDF
Shrink scanned or image-heavy PDFs by re-drawing pages as JPEG.
PDF metadata editor
View and edit title, author, keywords and dates, or strip them all.
Excel & CSV tools
CSV to Excel
Turn CSV, TSV or TXT files into a real .xlsx workbook, keeping leading zeros.
Excel to CSV
Save any sheet of an .xlsx workbook as CSV, with the delimiter you need.
Excel to JSON
Turn a sheet into a JSON array of objects, using the first row as keys.
JSON to Excel
Turn a JSON array into an Excel or CSV table, flattening nested objects.
Merge Excel files
Stack rows from several workbooks into one sheet, or keep a sheet per file.
Remove duplicate rows
Delete repeated rows from Excel or CSV, comparing whole rows or chosen columns.
CSV viewer
Open big CSV or Excel files as a table you can sort, filter and export.
Column letter converter
Convert Excel column letters to numbers and back, and decode cell addresses.
Why a browser-only toolbox
Most online PDF and spreadsheet tools ask you to upload your file to their server first. That is a poor fit for leases, tax forms, payslips, medical letters and customer lists, which are exactly the documents people need to sign, fill in or redact. PaperKit works differently: the page downloads the tool once, and from then on your file is opened, changed and saved by code running inside your own browser tab. Once a tool has loaded you can even switch your connection off and it keeps working.
What you get
- No uploads, no accounts. There is nothing to sign up for and no server that could keep a copy of your file.
- Real redaction. The redact tool turns each marked page into an image with the boxes burned in, then checks the result with a text extractor, so the hidden words are actually gone instead of sitting under a black rectangle.
- Signatures and forms without the paywall. Draw, type or upload a signature, add the date and initials, fill AcroForm fields or type onto a flat PDF, and download the result for free.
- Built for big files. Heavy work happens in a background worker, so long PDFs and large spreadsheets do not freeze the page.
- Honest about limits. Each tool page says what it cannot do, for example that a drawn signature is not a certificate-based digital signature, or that password-protected PDFs must be unlocked first.
Open-source building blocks
The tools are built on well-known, permissively licensed libraries: pdf-lib (MIT) writes and edits PDFs, pdf.js (Apache-2.0) draws pages and reads their text, and fflate (MIT) makes ZIP files. Spreadsheet reading and writing is our own small implementation for modern .xlsx files.