DataHub Tools

DataHub Tools

DataHub Developer Toolbox

DataHub Tools offers local-first data conversion, developer utilities, subtitle tools, and image tools in one clean toolbox.

Latest: JavaScript Formatter MinifierJSON Diff CompareTOML Formatter JSONSVG Optimizer

Data & Table Tools

JSON, CSV, Markdown, YAML, HTML tables, and SQL conversion tools for data cleanup.

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JT JSON to CSV Convert JSON arrays into downloadable CSV files. JSON / CSV CT CSV to JSON Convert CSV rows into clean JSON arrays in your browser. CSV / JSON CT CSV to Markdown Convert CSV or TSV data into a GitHub-style Markdown table. CSV / Markdown MT Markdown to CSV Convert Markdown tables into CSV rows for spreadsheets. Markdown / CSV JT JSON to Markdown Convert JSON arrays into Markdown tables locally. JSON / Markdown MT Markdown to JSON Convert Markdown tables into JSON arrays for data cleanup. Markdown / JSON HT HTML to Markdown Convert common HTML headings, links, lists, code, and tables into Markdown. HTML / Markdown MT Markdown to HTML Convert Markdown headings, lists, links, code blocks, and tables into HTML. Markdown / HTML YT YAML to JSON Convert YAML config into formatted JSON in your browser. YAML / JSON JT JSON to YAML Convert JSON objects and arrays into readable YAML. JSON / YAML HT HTML Table to CSV Extract HTML table rows and convert them into CSV. HTML table / CSV HT HTML Table to Markdown Convert HTML tables into GitHub-style Markdown tables. HTML table / Markdown HT HTML Table to JSON Extract rows from an HTML table and convert them into JSON arrays. HTML table / JSON CT CSV to HTML Table Convert CSV or TSV rows into clean HTML table markup. CSV / HTML table JT JSON to HTML Table Convert JSON arrays or objects into HTML table markup. JSON / HTML table CT CSV to YAML Convert CSV rows into readable YAML arrays locally. CSV / YAML YT YAML to CSV Convert YAML arrays or objects into CSV rows in your browser. YAML / CSV MT Markdown Table to SQL INSERT Convert Markdown tables into SQL INSERT statements. Markdown / SQL MT Markdown Table Generator Create Markdown tables from CSV, TSV, or pasted rows. CSV / TSV / Markdown CT CSV to SQL INSERT Convert CSV rows into SQL INSERT statements with escaped values. JT JSON to SQL INSERT Convert JSON arrays or objects into SQL INSERT statements locally. HE HTML Entity Encoder Decoder Encode HTML entities or decode escaped HTML text in your browser. HTML entities / text SF SQL Formatter Format common SQL SELECT, INSERT, UPDATE, and WHERE clauses for quick reading. SQL ET Excel to CSV Convert XLSX spreadsheets to CSV locally in your browser. Excel / CSV ET Excel to JSON Convert the first XLSX worksheet into formatted JSON arrays locally. Excel / JSON ET Excel to Markdown Convert XLSX worksheets into GitHub-style Markdown tables. Excel / Markdown ET Excel to HTML Table Convert XLSX worksheets into clean HTML table markup. Excel / HTML table CT CSV to LaTeX Table Convert CSV or TSV rows into LaTeX tabular markup for papers and notes. CSV / LaTeX JT JSON to LaTeX Table Convert JSON arrays into LaTeX tabular markup locally. JSON / LaTeX MT Markdown Table to LaTeX Convert Markdown pipe tables into LaTeX tabular markup. Markdown / LaTeX HT HTML Table to SQL INSERT Extract HTML table rows and convert them into SQL INSERT statements. HTML table / SQL HM HTML Minifier Minify HTML snippets by removing comments and unnecessary whitespace. HTML CM CSS Minifier Minify CSS by removing comments, whitespace, and redundant separators. CSS JF JavaScript Formatter Minifier Format or minify JavaScript snippets locally for quick debugging and cleanup. JavaScript / JS HF HTML Formatter Beautifier Beautify HTML snippets with readable indentation and local validation-friendly cleanup. HTML TF TOML Formatter JSON Format simple TOML config and convert it to JSON locally in your browser. TOML / JSON IF INI Formatter JSON Format INI files and convert section-based config into JSON locally. INI / JSON YF YAML Formatter Validator Validate YAML and format it with consistent indentation in your browser. YAML CT CSV to SRT Convert subtitle rows from CSV into SRT blocks with start time, end time, and text. CSV / SRT YT YAML to Markdown Convert YAML arrays or objects into Markdown tables for documentation. YT YAML to SQL INSERT Convert YAML records into SQL INSERT statements for quick seed data. YT YAML to HTML Table Convert YAML arrays or objects into clean HTML table markup.

Developer Tools

Encoding, formatting, SEO, HTTP, URL, regex, hash, and validation utilities for daily debugging.

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JF JSON Formatter Format, minify, and inspect JSON in your browser. JSON JV JSON Validator Validate JSON and find syntax errors quickly. JSON JD JWT Decoder Decode JWT header and payload locally. JWT CE Cron Expression Generator Build common cron expressions and explain existing schedules. Cron UE URL Encoder Decoder Encode or decode URL components and query strings locally in your browser. URL / query string BE Base64 Encoder Decoder Encode text to Base64 or decode Base64 back to readable text locally. Base64 / UTF-8 text UT Unix Timestamp Converter Convert Unix timestamps to readable dates and generate timestamps from date strings. Unix timestamp / date UG UUID Generator Generate random UUID v4 values locally for tests, records, and identifiers. UUID v4 TD Text Diff Checker Compare two text blocks line by line and highlight added, removed, and changed lines. PG Password Generator Generate secure random passwords, PINs, and passphrases locally in your browser. HG Hash Generator Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text locally. QS Query String Parser Parse URL query strings into readable JSON and inspect repeated parameters locally. URL query string / JSON JT JSON to URL Params Convert JSON objects into URL query parameters for API testing and links. JSON / URL parameters RT Regex Tester Test JavaScript regular expressions against sample text and list matches. regex / text CC Color Converter Convert HEX, RGB, and HSL colors with a compact local color report. HEX / RGB / HSL TC Text Case Converter Convert text to camelCase, PascalCase, snake_case, kebab-case, title case, and uppercase. camelCase / snake_case / kebab-case WC Word Counter Count words, characters, lines, sentences, and estimated reading time locally. words / characters / lines LS Line Sorter Deduplicator Sort text lines, remove duplicate lines, trim whitespace, and clean lists locally. text lines / lists SG Slug Generator Generate clean URL slugs from titles, file names, and headings. titles / URL slugs XF XML Formatter Validator Validate XML and format it with readable indentation in your browser. XML LI Lorem Ipsum Generator Generate placeholder paragraphs, sentences, and words for mockups and tests. placeholder text TD Title Description Length Checker Check SEO title and description length in characters and approximate pixel width. SEO title / meta description SP SERP Preview Tool Preview how a title, URL, and meta description may appear in Google search results. SERP / SEO title / description OG Open Graph Preview Preview a social card from Open Graph title, description, URL, and image fields. Open Graph / social card CC Color Contrast Checker Check text and background color contrast ratios for WCAG accessibility. HEX / WCAG / contrast UP URL Parser Parse a URL into protocol, host, path, query parameters, hash, and origin. URL OG Open Graph Meta Generator Generate Open Graph and Twitter Card meta tags from title, description, URL, and image. Open Graph / Twitter Card MT Meta Tags Generator Generate title, description, canonical, robots, viewport, and language meta tags. SEO meta tags RT Robots.txt Generator Generate a clean robots.txt file with user-agent, allow, disallow, and sitemap directives. robots.txt SX Sitemap XML Generator Generate sitemap XML from a list of URLs with changefreq and priority values. sitemap XML / URLs HS HTTP Status Code Lookup Look up common HTTP status codes and understand what each response means. HTTP status codes MT MIME Type Lookup Look up common file extensions and MIME types for web headers and uploads. MIME types / file extensions BC Bytes Converter Convert bytes to KB, MB, GB, TB and compare decimal versus binary units. Bytes / KB / MB DC Date Calculator Add or subtract days from a date and calculate the difference between two dates. date / days JS JSON Schema Generator Generate a basic JSON Schema from a JSON object or array sample. JSON / JSON Schema JD JSON Diff Compare Compare two JSON objects and list added, removed, and changed paths locally. JSON / diff SO SVG Optimizer Optimize SVG snippets by removing comments, metadata, and unnecessary whitespace locally. SVG ST SVG to PNG Convert SVG text or files to high-resolution PNG. SVG / PNG TC Timezone Converter Convert dates and times between UTC, New York, London, Beijing, Tokyo, and other time zones. UA User-Agent Parser Parse browser, operating system, device, engine, and bot hints from User-Agent strings. JV JWT Validator Decode JWT tokens and verify HS256 signatures locally with a shared secret. BA Basic Auth Generator Generate HTTP Basic Authorization headers from a username and password locally. UQ URL Query Builder Build clean URLs and query strings from key-value pairs for API testing and links. XT XML to JSON Convert XML documents into readable JSON objects locally in your browser. JT JSON to XML Convert JSON objects and arrays into XML markup locally in your browser. IM Image Metadata Remover Remove image metadata by re-exporting JPG, PNG, or WebP files locally in your browser. HG HMAC Generator Generate HMAC-SHA signatures from a secret and message locally in your browser. IS IPv4 Subnet Calculator Calculate network address, broadcast address, usable host range, and subnet mask from CIDR.

Subtitle Tools

Subtitle conversion, cleanup, transcript, and timing utilities for lightweight media publishing workflows.

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ST SRT to VTT Convert SRT subtitles to WebVTT format locally. SRT / VTT VT VTT to SRT Convert WebVTT subtitles to SRT format locally in your browser. VTT / SRT ST SRT to Text Extract clean transcript text from SRT subtitle files. SRT / transcript ST Subtitle Time Shifter Shift SRT or VTT subtitle timestamps forward or backward by milliseconds. SRT / VTT / timestamps AT ASS to SRT Convert common ASS or SSA subtitle dialogue lines into SRT format. ASS / SSA / SRT ST SBV to SRT Convert YouTube SBV subtitle blocks into SRT format locally. SBV / SRT

Image Tools

Local image compression, resizing, and format conversion for web publishing.

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IC Image Compressor Compress images in your browser with quality and format controls. JPG / PNG / WebP QC QR Code Generator Generate downloadable SVG QR codes for URLs, text, Wi-Fi notes, or contact snippets. AT AVIF to PNG Convert AVIF images to PNG in your browser. AVIF / PNG AT AVIF to JPG Convert AVIF images to JPG with quality control. AVIF / JPG PT PNG to WebP Convert PNG images to smaller WebP files. PNG / WebP JT JPG to WebP Convert JPG images to WebP with quality control. JPG / WebP WT WebP to PNG Convert WebP images to PNG locally in your browser. WebP / PNG WT WebP to JPG Convert WebP images to JPG with quality control. WebP / JPG HT HEIC to JPG Convert iPhone HEIC photos to JPG in your browser. HEIC / JPG HT HEIC to PDF Convert HEIC photos into a downloadable PDF. HEIC / PDF IR Image Resizer Resize images by width, height, or percentage. JPG / PNG / WebP JT JPG to PNG Convert JPG images to PNG locally in your browser. PT PNG to JPG Convert PNG images to JPG with quality control locally. FG Favicon Generator Generate common PNG favicon sizes and HTML link tags from an image.