⚡ 72 tools · 21 workflow templates · Local tool processing

Free developer tools & workflows that run entirely in your browser

Format, validate, convert and compare JSON, JWT, CSV, SQL and more — then chain them into reusable workflows. Everything you paste is processed in your browser — no cookies or third-party analytics. We count anonymous visits at the CDN edge; the Agent Toolkit also sends coarse interaction categories that never include tool input.

Magic Box
Paste anything · 40+ formats auto-detected
waiting for input...
Featured tools
Secrets Scanner Phishing Link & Email Inspector OpenAPI Breaking Change Analyzer Unicode & Invisible Character Inspector
Daily Challenges Play today's 3-minute dev puzzle Practice API, regex, JSON, security, and workflow skills without leaving the browser. Sharpen real dev skills and keep a streak. Open challenge →
New & noteworthy

New tools, focused collections,
and powerful ways to work

A concise look at what is new or especially useful in Daily Developer Tools.

New collection

AI Agent Debugging & Integration Toolkit

Private, deterministic, instant inspection for agent responses, contracts, JWTs, API changes, and debugging evidence.

Open the toolkit →
New toolCase Converter

Convert identifiers between camelCase, snake_case, kebab-case, CONSTANT_CASE and URL slugs.
New toolchmod Calculator

Convert Unix file modes between octal and symbolic, with special bits explained.
Browse all developer tools →
Popular workflows

Chain tools into reusable workflows

Paste once and run multiple steps — decode, validate, sanitize and convert without leaving your browser.

API Response Debugger JWT Inspector CSV Cleaner to JSON Log Sanitizer (PII + secrets) SQL IN Clause Builder
See all workflows →
Browse by category

Every tool you need,
nothing you don't

WorkflowsNEW

Chain tools together

Pipe the output of one tool into the next. Build multi-step transforms without manual copy-paste.

JSON→Format→Extract→CSV
Explore workflows →
Explore by workflow

Tool clusters for
real developer tasks

Curated topic pages that group related tools, guides and workflows so you can go straight from a problem to the right utility.

Security

Security and debugging tools

Inspect suspicious links, review email headers, sanitize HAR files, verify webhook signatures, decode JWTs and inspect certificates.

Explore security & debugging tools →
AI agents

AI Agent Debugging & Integration Toolkit

Inspect tool responses, validate contracts, decode JWTs, detect secrets and analyze API changes locally.

Open the agent debugging toolkit →
Explore by role

Tools and workflows for
your daily job

Role-oriented starting points: the daily tasks, recommended workflows and top tools for how you actually work.

What makes DDT different

Not just another
tools site

Three power features most tool sites don't have — all in your browser, no account.

Encrypted share

Send your input as an AES-256 link — nothing hits a server.

Try it on a tool →

Workflows

Chain tools into a saved workflow — paste once, run many steps.

Build a workflow →

Checklists

Run release/QA checklists with built-in tool checks and evidence.

Open checklists →
Why Daily Developer Tools

Built for how developers
actually work

⚡

Instant, local processing

Format, validate, convert, and compare directly in your browser.

🔒

AES-256-GCM encrypted sharing

Share tool state via URL fragment. The encryption key never touches the server — it lives only in the URL hash.

🌐

Chainable workflows

Pipe tool output directly into the next step. Build multi-stage transforms without copy-paste.

✨

Magic Box auto-detect

Paste unknown data — JSON, CSV, JWT, XML, YAML — and Magic Box routes you to the right tool.

🛡

Secret detection

JSON, HAR and share flows flag potential API keys, tokens and passwords before you share output.

👤

No login, ever

Use every tool without creating an account or signing in.