Yes — the GNU diff -u output, what git diff and patch produce. Other formats (context diff, ed scripts) aren't supported.

What if the patch doesn't apply cleanly?

Conflicts are reported per-hunk with context. You'll need to resolve manually; the tool doesn't do 3-way merges.

Does it handle binary patches?

No — text-only. For binary diffs use bsdiff, xdelta, or git-binary-patch format tools.

Why use this over `patch` CLI?

For one-off applications without installing patch. Also useful for demos and teaching — visual before/after makes the diff intuitive.

Diff Patch Applier | DevTools Surf

DevTools Surf

Example: Diff Patch Applier

A worked example, rendered from real sample data. Sign in to run the tool on your own input.

Input

Hello World
This is line two
Third line here
---
@@ -1,3 +1,4 @@
 Hello World
-This is line two
+This is the updated line two
+New line inserted
 Third line here

Output

Hello World
This is the updated line two
New line inserted
Third line here

About Diff Patch Applier

Diff Patch Applier preview - Developer Utilities tool

Apply a unified diff patch to source text. Part of the DevTools Surf developer suite. Browse more tools in the Developer Utilities collection.

Use Cases

Developers applying code review patches to local branches
Open-source maintainers testing contributor-submitted patches
CI systems applying hotfix patches during emergency deployments
Documentation teams applying text corrections from diff files

Tips

Verify context lines match before applying the patch
Check the line offset if the patch fails to apply cleanly
Use unified diff format with 3 lines of context for best results

Fun Facts

The unified diff format was created by Wayne Davison in 1990 and became the default in GNU diff 2.0 — it replaced the older context diff format with a more compact notation.
Larry Wall created the 'patch' utility in 1985 — it became so essential to open-source development that it was one of the first tools installed on any Unix system.
Git internally stores commits as snapshots, not diffs — the diff is computed on-the-fly, which is why git can show diffs between any two commits almost instantly.

FAQ

Unified diff format?: Yes — the GNU diff -u output, what git diff and patch produce. Other formats (context diff, ed scripts) aren't supported.
What if the patch doesn't apply cleanly?: Conflicts are reported per-hunk with context. You'll need to resolve manually; the tool doesn't do 3-way merges.
Does it handle binary patches?: No — text-only. For binary diffs use bsdiff, xdelta, or git-binary-patch format tools.
Why use this over `patch` CLI?: For one-off applications without installing patch. Also useful for demos and teaching — visual before/after makes the diff intuitive.

Related Developer Utilities Tools

Collection JSON → cURL Git Diff → HTML Regex Visualizer Makefile Explainer Shell Script Linter GitHub Actions Visualizer HAR File Viewer API Response Mocker