00 / Redlinefy
Every change, exactly as it happened.
Edit a Word document and see precisely what you changed before you send it. Or drop in two versions and get an instant, word-by-word redline. Both run entirely in your browser.
Free. No sign-up. No installs.
The Editor
Master Services Agreement
2. Fees and Payment
The Client will pay the Provider a monthly fee of $9,500, payable within 15 days of the invoice date.
The Comparator
original.docx → revised.docx
2 paragraphs modified · 9 words added, 2 removed
2. Fees and Payment
The Client will pay the Provider a monthly fee of $8,000$9,500, payable within 3015 days of the invoice date.
Public launch — Week 16
- 1
1. Upload your document(s)
Drop a .docx into the editor, or drop two versions into the comparator — either way, the file never leaves your device.
- 2
2. See every change instantly
Word-level highlights appear in seconds — insertions underlined, deletions struck through — computed live in your browser tab.
- 3
3. Export or share the result
Download a clean copy and a marked-up redline, both real .docx files, or save a checkpoint to come back to.
01 / Two tools
One for editing, one for comparing.
The Editor
Upload a .docx (or start from a blank page), edit it with a real formatting toolbar, and save checkpoints as you go. When you download, you get a clean copy and a separate copy with every change marked — so you always know exactly what you're sending.
Open the editor →The Comparator
Drop in an original and a revised .docx and get a word-level redline in seconds — insertions, deletions, and table changes all called out, with the source documents one click away. Save the comparison and reload it anytime.
Compare two documents →02 / Why
Comparing two documents shouldn't mean squinting at two windows.
Word's own Track Changes is powerful but easy to get wrong — and most people end up eyeballing two drafts side by side instead. Redlinefy does that comparison for you, correctly, in seconds, and lets you edit with total confidence about what's actually changing before you hit send.
03 / Features
Built for people who actually read every line.
Word-level redlines
Every change is highlighted down to the word — insertions underlined, deletions struck through — not just "this paragraph changed."
Two clean downloads
A ready-to-send clean copy and a separate marked-up copy, both real .docx files that open in Word, Google Docs, or LibreOffice.
Full version history
Save a checkpoint any time you edit, then compare any two versions — adjacent, or ten apart — with one click.
Nothing leaves your browser
Documents are parsed, edited, and compared entirely client-side. Nothing is uploaded to a server, ever.
04 / Who it's for
Anyone who sends or receives a revised draft.
Contracts and legal
See exactly what a counterparty changed in a redline before you sign off on it.
Agencies and freelancers
Show clients precisely what changed between drafts, without a lengthy changelog email.
Anyone with two Word files
No Word install, no macros, no mailing a document back and forth to compare it.
Privacy, not a checkbox
Your documents never leave your browser. Not once.
Every parse, edit, and comparison runs as plain JavaScript on your device. There's no upload endpoint to trust — because there isn't an upload at all.
- Zero file uploads
- Nothing stored on any server
- Verifiable in your Network tab
See what changed. In ten seconds.
Free. No sign-up. No installs.
05 / FAQ
FAQ
Do I need to install anything?
No. Both tools run entirely in your browser tab — there's nothing to install and no account required to try them.
Is my document uploaded anywhere?
No. Parsing, editing, and comparing all happen locally in your browser. Your files are never sent to a server.
What parts of a Word document are supported?
Paragraphs, bold/italic/underline, links, bullet and numbered lists, inline images, and tables. Documents with headers, footers, footnotes, comments, or existing tracked changes aren't supported yet — you'll get a clear message instead of a corrupted file.
Is it free?
Yes, both tools are free to use while Redlinefy is in early access.
06 / Blog
Blog
Blog →Sep 30, 2026
Redline vs. Blackline: What's the Difference?
"Redline" and "blackline" get used interchangeably, but they don't mean the same thing. Here's the actual difference, and which one you need.
Read more →Sep 30, 2026
Contract Redlining Checklist: What to Check Before You Sign
A practical, step-by-step checklist for reviewing a redlined contract before signature — what to check, what to ignore, and the mistakes that let bad changes slip through.
Read more →Sep 27, 2026
Client-Side Document Comparison: Redlining Without Uploads
Comparing contracts usually means uploading both files to someone else's server first. Here's why that's a real risk, and how client-side redlining avoids it entirely.
Read more →