Free Document Tools
Transform documents with free CSV/JSON converters, Markdown preview, text diff, and cleanup utilities. No uploads required.
All free document tools
12 free tools — no signup
Markdown Previewer
Live Markdown editor with HTML preview.
CSV to JSON
Convert CSV spreadsheets to JSON.
Text Diff
Compare two texts and highlight differences.
Remove Duplicate Lines
Strip duplicate lines from any list.
Number Lines
Add sequential numbers to each line.
ROT13 Cipher
Encode and decode text with ROT13.
Caesar Cipher
Encode text with a Caesar letter shift.
CSV to TSV
Convert CSV files to TSV format.
JSON to CSV
Convert JSON arrays to CSV tables.
Image to Base64
Encode images to Base64 data URLs.
Base64 to Image
Decode Base64 strings into images.
Prefix Suffix Lines
Add prefixes and suffixes to each line.
FAQ
Are these document tools really free?
Yes. Every tool in this category is free to use with no account and no paywall. Processing runs in your browser whenever the tool supports client-side workflows.
Do files upload to a server?
No. Document conversions and previews run locally in your browser.