File, document and everyday web utilities
Browser-based utility tool collections
Websites and apps bundling many small client-side tools—JSON formatters, converters, PDF/image utilities, calculators—plus related spreadsheet/CSV cleaning, querying and data-viewing tools, mostly processing data locally without uploads.
Built for: Developers, analysts, everyday users
Projects since May 04
224
Different builders
213
Last 4 weeks vs 8 before
+16%
AI is the core
9.8%
Projects per week
Mostly web app (64%), browser extension (15%), desktop app (8.5%) · from r/SideProject, r/chrome_extensions, r/SaaS, r/vibecoding
Latest
- PolarSort — Cleans large CSV and TSV files locally by deduplicating rows, validating emails and phone numbers, and running column calculations.“I built PolarSort — offline data cleaning for 15GB+ files (and just shipped it)”
- Catalog Snapshot Guard — Reviews supplier CSV batches for missing or ambiguous SKUs, preserving raw identifiers and source line references in reports and holding unclear product groups for human review.“Catalog Snapshot Guard: a CSV review tool that keeps SKUs and source rows intact”
- empinet.dev — Provides a collection of browser-based developer utilities such as JSON formatters, converters, JWT decoders and image tools.“We made our internal developer toolbox public. Free, and everything runs in your browser.”
- DocsTo App — Converts a Google Sheet or Excel file into a mobile-friendly web page with a shareable link and QR code that updates when the sheet changes.“I made a tool that turns Google Sheets into clean mobile pages. Would love your feedback!”
- JSON Formatter — Formats and validates JSON in the browser with a tree view, search, and line-and-column error pointing.“I built a JSON formatter for myself and now use it every day at work”
- insightbox — Processes data through a pipeline that the author has sped up from one minute to 26 seconds.“Just optimized my pipeline”
- LucidRows — Exports columns from web page tables or repeated rows to CSV, processing data locally in the browser.“LucidRows: point at a table, export CSV, stays on your machine”
- Dashboard Builder — Turns a local CSV file into a drag-and-drop dashboard with suggested charts and exports it as a standalone HTML file.“I built a free, local, drag-and-drop dashboard builder—feedback requested :)”
- Internet Utility Toolkit — Provides a collection of browser-based utilities for formatting data, converting files, and doing calculations.“I built a free web utility toolkit — looking for honest feedback”
- Web Toolkit — Provides a collection of image, PDF, and developer utilities that run entirely in the browser without uploading files.“I built a free Web Toolkit with tools (Image Compressor, PDF tools, Dev Utils) – 100% private, no server uploads.”
- DMTool — Runs JSON and clipboard text transformations from a macOS menu bar app.“Open-source menu bar tool for JSON and clipboard transformations - DMTool v0.5.0”
- JSON Viewer — Formats, inspects, and edits JSON files in a native macOS app with a tree view and validation.“I built a native macOS JSON viewer and formatter”
- Northmeld — Previews proposed cleanup changes to CSV and Excel files in the browser, with undo, redo, export, and reusable recipes.“I made a CSV cleanup tool that shows proposed changes before you apply them”
- Toolity — Bundles over 100 small free browser-based utility tools, such as password, UUID, and JWT generators, converters, calculators, and testers, in one site.“I got tired of bookmarking 20 different tool sites, so I built one with 100+ of them. What should I improve?”
- Decision Cloud — Runs per-row LLM judgments across large tabular datasets and returns structured results to ChatGPT.“ChatGPT is great at judging one row. 100k rows gets weird.”
- Captain Json — Formats and inspects JSON data in the browser.“100+ installs on my chrome extension "Captain Json"”
- nolainquery — Answers natural-language questions about Excel spreadsheets and produces auditable artifacts showing how each answer was computed.“I made a program that let's you ask queries to your Excel sheets in natural language”
- JSONaire — Opens large JSON files natively on macOS and lets users browse, query, and sort them as tables.“I built a fast native JSON viewer for Mac after my old one kept crashing on huge logs”
- HackKit — Bundles many offline developer utilities, such as encoders, hash generators, JWT decoding, and regex testing, into one HTML file that runs in the browser.“I got tired of juggling 20 random "hacker tool" sites, so I built HackKit: an offline dev utility suite in a single HTML file”
- Parsekit — Formats, validates, converts, and merges JSON files entirely in the browser.“Built Parsekit — free, zero-tracking JSON tools that run entirely in your browser”
Most discussed
- Calsico — Turns Google Sheets spreadsheets into shareable interactive calculators, forms, and pricing tools that can be embedded without code.“First customer. First lifetime deal. 🚀”
- Generates custom output files, delivered as downloadable HTML and JSON, from user input without requiring login or a database.“My Tool crossed 2000+ users today”
- Imports data from multiple sources and combines them into a business dashboard.“I made a platform and sold it to my company”
- utily.ai — Hosts a directory of over 7,000 web-based utility tools, many running directly in the browser.“I spent 2 years building a site with 7,000+ web tools”
- Cleans up messy spreadsheets that construction, trucking and HVAC companies currently fix by hand each week.“Launched my first SaaS targeting construction/trucking ops teams. 10 emails sent, 0 replies. What am I missing?”
- PracticalTools.co — Provides a collection of over 150 free browser-based utilities, including PDF merging, barcode and QR generators, and business calculators, with no signup required.“I got tired of forced signups and paywalls just to merge a PDF or use a simple calculator, so I built a site with 150+ free, private utilities.”
- Provides a collection of browser-based developer utilities such as JSON parsing, code minifying, string conversion, and hash generation, running entirely client-side.“How I scaled a free utility platform to 425K active users (and 6,200+ concurrent) with practically zero server bills. Here’s the architecture.”
- dimastoolbox — Offers a collection of free online utility tools, including QR code generation, with no paywalls, subscriptions or accounts.“I created a website with free tools.”
- TooliaVerse — Hosts over 200 small browser-based utility tools, such as JSON formatting, color and shadow generators, and encoding converters, that run client-side without signup.“I built 200+ browser-based tools because I was tired of ad-heavy "free tool" sites. Here's TooliaVerse”
- Builds reusable reporting dashboards from spreadsheet data so weekly metric updates don't require rebuilding slides.“What should I do next with my product?”