OK Tools — Free PDF & JSON Utility Tools

Compress PDF

Re-pack a PDF in your browser to trim its size.

PDF → Smaller PDF

Merge PDF

Combine several PDFs into one, in the order you choose.

PDFs → One PDF

Split PDF

Extract pages or split a PDF by page ranges.

PDF → Pages

Delete PDF pages

Remove unwanted pages from a PDF.

PDF → Fewer pages

Insert PDF pages

Insert pages from one PDF into another at any position.

PDF + PDF → Combined PDF

Stamp / watermark PDF

Add a text watermark or image seal to PDF pages.

PDF → Stamped PDF

JSON Formatter

Format, validate, and minify JSON in your browser.

JSON → Formatted

Base64 Encode / Decode

Encode or decode Base64 text with UTF-8 in your browser.

Text → Base64

JSON Tree View

Explore JSON as a collapsible, syntax-highlighted tree.

JSON → Tree

JSON to CSV

Convert JSON to CSV with custom delimiter and header toggle.

JSON → CSV

CSV to JSON

Parse CSV into JSON arrays or objects in your browser.

CSV → JSON

JSON to YAML

Convert JSON documents to readable YAML.

JSON → YAML

YAML to JSON

Parse YAML into pretty-printed JSON.

YAML → JSON

JSON to XML

Serialize JSON into well-formed XML.

JSON → XML

XML to JSON

Parse XML documents into JSON structures.

XML → JSON

JSON Validator

Validate JSON and highlight error line/column.

JSON → Valid / Errors

URL Encode / Decode

Percent-encode or decode URL strings safely.

Text → URL Encoded

JSON Diff

Compare two JSON docs and highlight key-path changes.

JSON A / B → Diff