Professional online diff viewer for comparing text, JSON, XML, logs, code snippets, API responses, and configuration files with side-by-side or inline highlighting.
Provide the baseline input on the left and the revised input on the right.
Paste or upload baseline data
Paste or upload revised data
Use this professional online diff and compare tool when you need to inspect API responses, validate deployment changes, compare configuration files, review copied code blocks, or analyze log output. Developers and QA engineers can paste JSON payloads, XML responses, environment files, stack traces, CSV exports, or plain text and quickly see what changed between the original and modified versions.
The comparison view is designed for 100+ line workflows with side-by-side diff, inline diff, line numbers, synchronized scrolling, highlighted changes, and collapsed unchanged sections. It keeps large text files readable without forcing you into a heavy desktop editor, while still preserving indentation, spacing, and code-friendly monospace formatting.
Paste the original JSON on the left and the modified JSON on the right, then click Compare. You can use Beautify JSON or Minify JSON first to normalize formatting before reviewing the side-by-side diff.
Yes. Upload or paste XML in both editors, then compare. The XML tools can beautify or minify valid XML, and invalid XML is handled with a clear message without changing your content.
Yes. The diff viewer is built for practical 100+ line comparisons and works well for logs, JSON responses, XML files, code snippets, and configuration files. Very large files still depend on browser memory and device performance.
No. Comparison, formatting, and file reading run in your browser. Your pasted text and uploaded files are not sent to UseBoldTools servers for this tool.
Yes. The editor preserves monospace formatting and line breaks, so it is useful for comparing logs, copied code blocks, API output, CSV exports, environment variables, and config files.
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