AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I compare two files online?

Paste two texts or drop two files into AnyTool's File Comparator. It diffs them in your browser — line, word, or character level, side-by-side or inline — and also does a binary byte/hex compare. Differences are highlighted instantly and nothing is uploaded.

  • Line, word, or character-level text diff
  • Side-by-side and inline views · ignore whitespace / case
  • Binary byte comparison with hex view and first-difference offset
  • 100% in your browser — no upload, no signup, works offline

What is

File Comparison (Diff)

File comparison finds the differences between two files. A text diff aligns lines (or words/characters) and marks additions and deletions; a binary diff compares raw bytes and reports the first differing offset.

File Tools

Related terms

DiffText CompareBinary CompareSide-by-side Diff

How to Compare Two Files

Compare two files or texts entirely in your browser.

15 secWeb browser
  1. 1

    Add inputs

    Paste two blocks of text, or upload two files. Nothing is uploaded.

  2. 2

    Choose mode

    Pick text diff (line, word, or character) or binary byte comparison.

  3. 3

    Refine

    Switch between side-by-side and inline, and ignore whitespace or case if needed.

  4. 4

    Export

    Copy or download the differences as a unified .diff file.

Result: A highlighted diff or a .diff file

Frequently Asked Questions

Yes — AnyTool compares files in your browser, so they never leave your device.

The diff runs entirely client-side with the jsdiff library; no file is uploaded to any server.

Yes — switch to binary mode for a byte-by-byte hex comparison.

Binary mode reports the percentage of matching bytes, the first differing offset, and a paired hex view.

Yes — choose word or character granularity to highlight intra-line changes.

Beyond line diff, word and character modes highlight the exact changed words or characters within a line.

Detailed Explanation

Methodology

How File Comparison Works

AnyTool compares files entirely in the browser. Text comparison uses the jsdiff library (Myers diff) at line, word, or character granularity, producing inline and side-by-side views with additions and deletions highlighted. Binary comparison walks the raw bytes to compute the match percentage, the first differing offset, and a paired hex/ASCII view.

  • Runs client-side via jsdiff — files are never uploaded
  • Line, word, and character granularity
  • Side-by-side and inline (unified) views
  • Ignore whitespace and ignore case options
  • Binary mode: byte match %, first-diff offset, hex view
  • Export a unified .diff file
Privacy & Security

Privacy and Offline Use

Because comparison happens entirely in the browser, files never touch a server. The tool works offline after first load and has no fixed file-size limit beyond available device memory.

File comparison: in-browser (AnyTool) vs typical online diff tools
CapabilityAnyToolTypical online diff tools
File handlingCompared in your browserOften uploaded to a server
GranularityLine / word / characterOften line only
Binary compareYes (hex)Rare
File-size limitDevice memory onlyCommonly capped on free tier
Cost / signupFree, no signupOften limited or gated

Capabilities reflect the live AnyTool tool; competitor behavior varies by service.