You know the email. Someone sends back "final_v2", swearing only the date changed. Or a client approves a page of copy, it goes live reading differently, and nobody knows who touched it. You need both versions open together, with every changed word marked, right now, not after a signup form. That's the whole job of a diffchecker alternative.
Diffchecker is the name most people reach for, and its free web plan covers the basic text diff. But the features that make it genuinely useful sit behind Pro at $15 per user a month. So the honest question isn't whether Diffchecker is good. It's whether a free diffchecker alternative already does your actual job.
Short answer: if you're comparing two blocks of text or code, the Diff Checker on this site does it free, with no ads and nothing held back. If you're comparing Word documents, PDFs, spreadsheets, images or whole folders, or you need to send someone a link to a diff, Diffchecker is still the tool. One disclosure first: the Xplosole tool is this site's own. That's exactly why I'll also name where it loses.
Diffchecker vs Xplosole at a glance
| Diffchecker (free web plan) | Xplosole Diff Checker | |
|---|---|---|
| Price. | Free web plan. Pro + Desktop $15 per user a month. | Free. No paid tier. |
| Text diff, side by side. | Yes, free. | Yes, free. |
| Word and character precision. | Smart precision free. Fixed precision is Pro. | Both free. You pick. |
| Unified (single-column) view. | Pro. | Yes, free, as the inline view. |
| Syntax highlighting. | Pro. | Not yet. |
| Merge changes. | Pro. | Not yet. |
| Save or share a diff by link. | Pro. | No. |
| Export as PDF. | Pro. | No. |
| Word, PDF, Excel or image diff. | Yes. | No. Text and code only. |
| Whole-folder compare. | Pro, via the Desktop app. | No. |
| Ads on the free version. | Yes. | No. |
| Signup needed. | No. An account is needed to save one. | No. |
| Where the text diff runs. | In your browser. | In your browser. Nothing uploaded. |
Diffchecker: the market leader, and what free actually means
Diffchecker earns its reputation. The free web plan gives you a side-by-side text comparison with Smart precision, which picks word or character level for you, and it needs no signup. Its homepage says the text diff has no file-size limit. Reviewers rate it 4.6 out of 5 on G2, and the complaints are mostly about the same thing: the good stuff costs money.
That's the catch, and it's worth spelling out. Unified view, fixed word or character precision, syntax highlighting, real-time editing, merge, AI summaries, PDF export, saving and sharing a diff, dark mode and an ad-free page are all Pro features. Diffchecker calls them "free to try" and doesn't publish a number for how many free tries you get. Unlimited use needs Pro + Desktop at $15 per user a month. Legal is $20 and Enterprise is $40, for firms that need redlines and single sign-on. Prices checked on diffchecker.com/pricing, 10 November 2026.
Where Diffchecker genuinely wins is breadth. It compares Word, PDF and PowerPoint documents, images, Excel spreadsheets and whole folders, with OCR for scanned pages and moved-content detection. No free text-only tool touches that. If your week involves redlining contracts or checking a revised spreadsheet, that breadth is the whole argument, and $15 a month is cheap for it.
Best for: comparing documents, images, spreadsheets or folders, or sharing a diff by link.
Xplosole Diff Checker: the free option with nothing held back
Here's the other side of the trade, and yes, this is the tool this site makes. Paste two versions of a text or code file and the differences light up as you type, word by word, or letter by letter in character mode. Two views cover the two situations: split for long documents, stacked when the screen is narrow. Say a supplier sends back a 30-page agreement and only nine lines moved. The arrows take you to each of those nine in turn, so you stop scrolling past pages of unchanged text.
Two toggles do the quiet work. Ignore spaces hides the noise when someone ran a file through a formatter and every line looks changed. Ignore case hides edits that only change capitalisation. Tick them first and the genuine edits are all that is left to look at. You can open a file into either side from your device, tick Code font for source files, and copy the result, swap the sides or clear either side when you're done.
The privacy point isn't marketing. The comparison happens on your machine, using the Myers algorithm — the method Git relies on — via the jsdiff library. Your text is never uploaded, so a contract or an unreleased draft never leaves your machine. Close the tab and it's gone. Diffchecker's text diff also runs in your browser, but saving or sharing a diff stores a copy on its servers, and fully offline comparison is a Pro Desktop feature.
And the honest list of what it can't do yet: no syntax highlighting, no merge, no .diff or .patch export, no share link, no line numbers, no hiding unchanged lines, no document, image or spreadsheet comparison, and no custom ignore rules. If any of those is your daily job, this isn't your tool, and the table above says so plainly.
Best for: developers diffing config files between staging and production, editors checking a writer's "small tweaks", and anyone comparing two versions of text or code without an account, ads or a paywall. If you work with JSON a lot, format it first in the JSON Formatter and the diff reads far more cleanly. The Regex Tester does the same cleanup for patterns.
So which one should you use?
Start from the file in front of you, not the brand name. Two blocks of text or code? A free text diff checker covers it, and paying $15 a month for the same diff would be silly. A Word document against its revised version, a spreadsheet, a folder of files? Diffchecker, without a second thought. Need to send a colleague a link to the exact differences? Diffchecker again, because a link is a feature the free tool simply doesn't have.
The mistake isn't choosing the wrong tool. It's paying before checking whether your job is a text job. Most diffs are. A contract clause, a config file, a page of copy, a data extract. All text, all free, all done in seconds. Try the free one first. If it hits a wall, that wall tells you exactly which Diffchecker plan you actually need, instead of a guess.
Other names you'll see
Draftable is the legal-grade pick, with a free online text comparison and paid desktop and API products for exportable redlines. Mergely is open source, runs entirely in your browser, and does merge — the one feature the Xplosole tool most obviously lacks. Text Compare is the minimalist of the bunch: paste two blocks, see the differences, leave. None of them is wrong. They answer slightly different versions of the same question: what are you comparing, and does anyone else need to see it?
Frequently asked questions
Is Diffchecker free?
Yes. The web text comparison is free and needs no signup, but it shows ads. The Pro features — syntax highlighting, merge, PDF export, saving and sharing diffs, dark mode and the desktop app — need Pro + Desktop at $15 per user a month.
Is there a completely free alternative to Diffchecker?
For text and code, yes. The Diff Checker on this site is a free diff checker, with no account, no ads and no usage cap.
Does the Xplosole Diff Checker upload my text?
No. Everything runs in your browser and nothing is sent to a server, so you can compare confidential documents and unreleased copy without a second thought. Close the tab and it's gone.
Can I compare Word documents or PDF files?
Not with the Xplosole tool. It handles text and code only. Diffchecker compares Word, PDF, PowerPoint, Excel and image files, and whole folders through its Desktop app.
One last thing. If you're tidying text before a comparison, say stripping repeated lines out of a pasted log, the guide to removing duplicate lines walks through it. Clean input, clean diff. And if the free tool ever feels too thin, that feeling is useful: your job has outgrown text, and now you know exactly what to pay for.