csvjson.tools
JSON Formatter & Validator
Convertio
JSON Editor Online
CSVJSON
JSON Formatters
JSON to CSV
JSONtoCSV.wiki
Markdrop
BugHerd
Pastel
Webvizio
csvjson is a free, browser-based toolkit for converting data between the formats developers and analysts use daily: JSON, CSV, Excel, YAML, XML, SQL, and more. Every conversion runs entirely in your browser. Nothing is uploaded to a server. Nothing is logged. No account required, no file size limits. Converters include: JSON โ CSV, Excel, YAML, XML, SQL, TSV CSV โ JSON, Excel, SQL Excel โ JSON, CSV XML โ JSON, YAML โ JSON, NDJSON โ JSON Developer tools include: JSON Formatter, Validator, Schema Validator JSON Path Finder, Flatten JSON JWT Decoder, Regex Tester, Diff Checker SQL Formatter, Cron Builder Base64, URL Encode/Decode, Hash Generator (SHA-256/512) UUID Generator, Timestamp Converter CSV Viewer/Editor, CSV Cleaner QR Code Generator, Markdown Preview Developers use it to transform API responses, generate SQL seed data, decode JWTs, and validate schemas. Analysts use it to clean and reformat exports before loading into Excel or Sheets. Non-technical users use it to open a JSON file or convert a CSV without writing any code. Most online converters upload your data to their servers. csvjson processes everything locally using JavaScript โ your data never leaves your device. This matters for anyone handling production data, customer records, or anything governed by data privacy policies
csvjson.tools
MarkdropMarkdrop's answer:
Markdrop combines powerful visual feedback, screen recording, and developer-ready bug reporting into a single, lightweight tool that feels invisible until you need it. Unlike bloated alternatives, Markdrop is fast, easy to integrate, and built for modern teams who care about speed and clarity with no Chrome extension or signup friction required.
Markdrop's answer:
Affordable, transparent pricing: Markdrop offers all the core features at a fraction of the cost of tools like Markup.io or Pastel.
Designed for devs and designers: Every comment can include logs, screen recordings, and environment data ready for developers to act on.
No friction for users: Share a link and anyone can leave feedback. No browser extensions, no accounts, no hassle.
Fast and privacy-respecting: Lightweight script, GDPR-compliant, and zero tracking bloat.
All-in-one: Combines comments, annotations, bug reporting, and async video so teams donโt need 3 different tools.
Markdrop's answer:
Markdrop is built for:
Founders and indie builders who want fast feedback without complex tools
Designers and PMs collecting client or stakeholder feedback
Developers who want bug reports with context, not vague screenshots
Agencies delivering websites and apps that need client review In short, itโs for lean product teams who value clarity and speed.
Markdrop's answer:
Markdrop was born out of frustration. As a solo founder building multiple products, I (Manuel) kept running into the same feedback pain, long email chains, vague bug reports, and overpriced tools that did too much or too little. So I built what I needed: a clean, no-fuss tool to drop comments directly on a site, see what users saw, and get back to shipping.
Markdrop's answer:
Which are the primary technologies used for building your product?
Frontend: Svelte 5 Backend: Cloudflare Workers, D1, and Durable Objects Database: Wrangler DB (D1) DevOps/Infra: Cloudflare Pages + R2 for static assets and file storage
Markdrop's answer:
Indie founders using Markdrop to launch and iterate faster
Agencies working with clients.
YC applicants using it to get fast design review
No-code builders collecting client feedback inside Webflow
Internal product teams replacing Slack screenshots with structured feedback
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.
BugHerd - BugHerd: The Website Feedback Tool for Agencies
Convertio - File Conversion in the Cloud
Pastel - Sticky note-based feedback collection tool for live websites
JSON Editor Online - View, edit and format JSON online
Webvizio - This free website feedback tool & website review software allows managers and teams to collaborate on website revisions in real time. Join for free now!