For QA Engineers
Upload two screenshots and see every pixel that changed — layout shifts, color changes, moved elements, missing components. Set a tolerance to filter rendering noise and focus on real bugs.
See it in action
Use cases
Upload a screenshot before and after your deploy. See exactly what moved, shifted, or disappeared — at pixel level.
Same page, Chrome vs Firefox. Spot layout differences that only appear in specific browsers or viewports.
Before and after a UI library update. Catch subtle changes in spacing, typography, or color that slip through code review.
Also useful
Testing API changes? Paste two JSON payloads and see exactly what changed. Structure-aware — whitespace differences are normalized automatically. Works with YAML too.
Compare Files works entirely in your browser. There is no server that receives, processes, or stores your file data. Not because we promise not to look — but because we architecturally cannot. All comparison logic runs locally in JavaScript.
Why no AI
Compare Files uses a deterministic, logic-based engine — not a language model. It reads both files and reports every change that is actually there. It can’t summarize away a deleted line, invent a difference that isn’t in the file, or “mostly” get a number right. What you see is exactly what changed — nothing added, nothing missed. For QA, that means no AI glossing over a subtle config, copy, or rendering change.
Your files never leave your device. Everything runs in your browser — no uploads, nothing stored.
No AI, so no hallucinations. A deterministic engine reports every real change and never invents one.
No upload, no server wait. Comparisons run locally and keep working offline once the page has loaded.
FAQ
Upload two screenshots and the tool highlights every pixel that differs between them — changed UI elements, layout shifts, color changes, and missing components all show up immediately. It is designed for manual spot-checks during exploratory testing, not CI pipeline integration.
It controls how sensitive the pixel diff is — set it low to catch every subtle change, or raise it to filter out anti-aliasing differences and rendering artifacts that are not real regressions. This lets you focus on genuine UI bugs rather than noise from font rendering or subpixel differences.
Yes — paste two JSON responses and Compare Files highlights every structural and value difference, including added or removed keys, changed values, and type mismatches. JSON comparison is completely free, so there is no cost for API response diffing.
No installation required — it runs entirely in your browser. It is a manual spot-check tool for moments when you need to quickly verify a screenshot or diff two API payloads during exploratory testing, without switching to a terminal or setting up tooling.
Yes — YAML and JSON config file comparison is fully supported and free. If you need to verify that a staging config matches production, or check that a deployment did not alter environment variables, paste or upload both files for an immediate structured diff.
All tools
No signup required for text and free features. Image comparison unlocks with Pro — €9.99/mo. Text and JSON/YAML are always free.
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