Free Online Data Tools

JSON formatter, Base64 encoder, CSV to JSON and 29 free data tools — no sign-up.

29 free data tools — no sign-up needed
29 tools in
this category

JSON Formatter

Pretty-print or minify JSON, with optional alphabetical key order.

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JSON Validator

Check whether JSON parses, and see structure details or the exact error position.

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Base64 Encoder

Encode text to Base64, including full Unicode, with an optional URL-safe alphabet.

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Base64 Decoder

Decode Base64 back to text. Handles URL-safe input and missing padding.

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URL Encoder

Percent-encode a value for a query string, or escape a whole URL.

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URL Decoder

Turn percent-encoded text back into readable characters.

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HTML Entity Encoder and Decoder

Escape text so it is safe inside HTML, or convert entities back to characters.

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Number Base Converter

Convert whole numbers between binary, octal, decimal, hex and any base from 2 to 36.

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CSV and JSON Converter

Turn CSV into JSON records, or JSON records back into CSV.

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Query String Parser

Split a URL into readable parameters, and build a query string back from them.

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Hash Generator

SHA-1, SHA-256, SHA-384 and SHA-512 checksums of any text.

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String Escape and Unescape

Escape text for use inside a JavaScript or JSON string literal, or reverse it.

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ISBN Validator and Converter

Validate a book's ISBN-10 or ISBN-13 checksum and convert between the two formats.

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File Hash Calculator

Compute SHA-256, SHA-384 or SHA-512 checksums of a file without uploading it.

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CSV/JSON to Excel Converter

Turn pasted CSV or JSON rows into a downloadable .xlsx spreadsheet.

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Markdown and HTML Converter

Render Markdown as HTML, or convert HTML back into Markdown.

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JSON Diff Checker

Compare two JSON documents structurally and list what was added, removed or changed.

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Base32 Encoder and Decoder

Encode text to RFC 4648 Base32, or decode Base32 back to text.

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XML Formatter and Validator

Pretty-print XML with indentation, or check whether it parses correctly.

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URL Parser and Builder

Break a URL into its parts, or build one from protocol, host, path and query parameters.

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IP Subnet (CIDR) Calculator

Work out the network range, broadcast address and host count for an IPv4 CIDR block.

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UUID Validator and Inspector

Check whether a UUID is well-formed and identify its version and variant.

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JSON Path Extractor

Pull a value out of JSON using a simple dot/bracket path like a.b[0].c.

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List Comparison

Compare two lists and find items only in A, only in B, or in both.

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IBAN Validator

Check whether an IBAN is valid, and see its country, length and formatted grouping.

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Credit Card Validator

Check a card number's Luhn checksum and detect its network, such as Visa or Mastercard.

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YAML and JSON Converter

Convert YAML into JSON, or JSON into YAML.

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Password Strength Checker

See how strong a password is, with an estimated crack time and a checklist of what it's missing.

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HTML Table Generator

Turn pasted CSV, TSV or spreadsheet data into ready-to-use HTML table markup.

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About

About Data Tools

Toolapt's 29 free online data tools help you format, validate and convert the data you work with every day. Pretty-print or minify JSON with the JSON Formatter, find the exact error with the JSON Validator, compare two JSON documents, and convert between CSV, JSON, YAML and Excel. Encode and decode Base64, Base32, URLs and HTML entities, generate SHA-256 checksums of text or whole files, format and validate XML, pull values out of JSON with a path, break URLs and query strings into their parts, compare two lists and work out IP subnet ranges. There are also validators for IBANs, credit card checksums, ISBNs and UUIDs. Paste your data and the result appears instantly — nothing to install, no account and no usage limit.

A few to try

FAQ

Frequently asked questions

Quick answers to the questions people ask most.

How do I format or beautify JSON online?

Paste your JSON into the JSON Formatter. It pretty-prints it with clean indentation, or minifies it onto one line, and can also sort keys alphabetically.

How can I check if my JSON is valid?

Use the JSON Validator. It tells you straight away whether the JSON parses, and if it doesn't, it shows the exact position of the error so you can fix it.

How do I convert CSV to JSON?

Open the CSV and JSON Converter and paste your CSV. Each row becomes a JSON record, and it works the other way too — JSON records back into CSV. To get an Excel file instead, use the CSV/JSON to Excel Converter.

How do I encode or decode Base64?

Use the Base64 Encoder to turn text into Base64 (full Unicode is supported, with an optional URL-safe alphabet), and the Base64 Decoder to turn it back into readable text, even when padding is missing.

How do I compare two JSON files?

Paste both documents into the JSON Diff Checker. It compares them structurally, not line by line, and lists exactly which keys and values were added, removed or changed.

Which hash algorithms does the Hash Generator support?

It creates SHA-1, SHA-256, SHA-384 and SHA-512 checksums of any text. To hash a whole file instead, use the File Hash Calculator, which computes SHA-256, SHA-384 or SHA-512 checksums without uploading the file.

Are these data tools free? Do I need to sign up?

All 29 data tools are completely free, with no account and no limit on how often you use them or how much data you paste. They work in any modern browser on phone, tablet and desktop.

Is it safe to paste my data or card numbers here?

Yes — every data tool processes what you paste in your own browser and nothing is uploaded to Toolapt. The IBAN Validator, Credit Card Validator and Password Strength Checker only check the value locally; none of them send it anywhere.

Still have a question? Contact us