How I compare two text blocks line by line

A text diff shows what changed between two blocks of text. It is useful for configs, logs, snippets, and documentation.

The Text Diff tool helps me inspect the input and output without writing a one-off script first.

The simple idea

A text diff shows what changed between two blocks of text. It is useful for configs, logs, snippets, and documentation.

I use it to answer one focused question at a time, then I review the result before using it anywhere important.

Step 1: Paste the old text on the left

Paste the old text on the left.

Step 2: Paste the new text on the right

Paste the new text on the right.

Step 3: Look for removed lines

Look for removed lines.

Step 4: Look for added lines

Look for added lines.

Step 5: Review changed lines in context

Review changed lines in context.

Step 6: Ignore formatting only if whitespace does not matter for that file

Ignore formatting only if whitespace does not matter for that file.

Step 7: Use the diff to review changes before applying them

Use the diff to review changes before applying them.

My checklist

Before I trust the result, I check:

• Paste the old text on the left.
• Paste the new text on the right.
• Look for removed lines.
• Look for added lines.
• Review changed lines in context.
• Ignore formatting only if whitespace does not matter for that file.
• Use the diff to review changes before applying them.

The tool makes the mechanical part faster. The decision still belongs to me: is this result correct, safe, and appropriate for the real task?