All Tools

CompareStack offers eight free online utilities for document comparison and developer workflows. Each tool includes detailed instructions, use cases, limitations, and FAQs on its dedicated page. Browse by category below or use search to jump directly to JSON formatting, PDF comparison, SQL beautification, and more.

New to the platform? Start with our blog guides on text diff discipline, spreadsheet audits, and API debugging—or read About CompareStack for how we handle uploads and privacy.

Compare

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Compare

Text Compare

Compare two text blocks and detect changed lines quickly.

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PDF
Compare

PDF File Compare

Extract text from PDF files and compare for differences.

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W
Compare

Word Document Compare

Compare Word documents by extracted textual content.

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📊
Compare

Excel File Compare

Compare Excel sheets by extracted rows and cell values.

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Format & beautify

SQL
Format

SQL Formatter

Format SQL queries with improved readability and structure.

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{ }
Format

JSON Formatter

Validate and pretty print JSON responses and payloads.

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</>
Format

Code Formatter

Apply basic indentation formatting for common code blocks.

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Encode & decode

🔗
Encode

URL Encode / Decode

Encode and decode URLs and query parameters safely.

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64
Encode

Base64 Encode / Decode

Encode text to Base64 or decode Base64 strings online.

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