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Last updated · CalcoWorks
Overview
About File Compare
Two code files can look similar until a missing brace, renamed function, or extra log line breaks a review. CalcoWorks File Compare shows Original and Changed side by side so you can paste or upload two text files and scan added, removed, and changed lines without opening an IDE.
Use it when a teammate sent two snippets in chat, when you exported configs from staging and production, or when you want a quick visual diff before a pull request. Unlike JSON Compare, this tool treats files as plain text — line order matters, and it works for JavaScript, Python, CSS, logs, Markdown, and any other text.
Developers paste before-and-after functions. QA diffs fixture dumps. Writers compare two article drafts. Support engineers line up two error logs. Keep secrets out of the paste boxes on shared machines.
Ignore whitespace when indent-only noise hides a real change. Ignore case for config keys that differ only in casing. Jump next/prev difference to skip identical blocks. Copy a unified diff when you need to drop the result into a ticket.
This is a two-sided viewer, not a three-way git merge. Huge binaries do not belong here — compare decoded text. Prefer redacted samples in tickets so the next person can reproduce the same diff without credentials.
Treat File Compare as a reading lamp for two text snapshots. Agree whether indent and case count as noise before you brief a teammate. Prefer redacted samples in tickets so the next engineer can reproduce the same highlights. Jump next difference instead of scrolling identical blocks. When the artefact is JSON and key order should not matter, switch to JSON Compare.
Benefits
- Side-by-side code and text diffs
- Paste or upload two files
- Highlights added, removed, and changed lines
- Ignore whitespace or case
- Jump between differences
- Copy unified diff for tickets
- Works for any text language
- No IDE required
- Free browser compare on CalcoWorks
- Synced scrolling on both panes
Use cases
- Compare two function versions from chat
- Staging versus production config files
- CSS before and after a redesign
- Log excerpts from two deploys
- Markdown draft versus published copy
- SQL schema dumps
- Student assignment vs solution
- i18n string files
- Dockerfile or nginx snippet reviews
- Quick PR preview without cloning
Examples
Example 1
Function rename
Left still uses greet(name); right adds an excited flag.
Preview: open File Compare and recreate this scenario with your numbers.Example 2
Config drift
Production timeout differs from staging by one line.
Preview: open File Compare and recreate this scenario with your numbers.Example 3
Log compare
Two error dumps differ after a retry loop.
Preview: open File Compare and recreate this scenario with your numbers.Example 4
CSS tweak
Padding and color tokens changed on a handful of rules.
Preview: open File Compare and recreate this scenario with your numbers.
How to use File Compare
- 1
Open File Compare
Go to Developer Tools then File Compare.
- 2
Paste left file
Put the original code or text on the left, or upload a file.
- 3
Paste right file
Put the changed version on the right.
- 4
Scan highlights
Red is removed, amber is changed, green is added.
- 5
Jump differences
Use Next/Prev diff to skip identical lines.
- 6
Tune noise
Turn on Ignore whitespace if indent-only changes clutter the view.
- 7
Copy if needed
Copy unified diff into a ticket or chat.
Frequently asked questions
Related tools
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- URL Encoder / DecoderEncode or decode URL components and query stringsOpen Tool
Suggested tools
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