Free online developer tools

Search below to jump to a utility—JSON, Markdown, Base64, URLs, PDF, diff, hashes, slugs, passwords, and time zones. Everything runs in your browser.

13 tools — type to filter

All tools

JSON FormatterPopular

Format, validate, and explore JSON with syntax highlighting and an interactive tree view.

Markdown Preview

Live Markdown preview with export HTML/PDF, copy, reset, and synced scrolling.

Base64 Encoder

Encode text or files to Base64. Supports URL-safe variant and MIME line breaks.

Base64 Decoder

Decode Base64 strings back to plain text. Supports standard and URL-safe Base64.

URL Encoder

Percent-encode URLs, URI components, and query strings instantly.

URL Decoder

Decode percent-encoded URLs and URI components back to plain text.

PDF to Base64

Encode a PDF file to Base64 and a data URI in your browser.

Base64 to PDF

Decode Base64 or a data URI back to a PDF with preview and download.

Diff Checker

Compare two texts side-by-side with line-by-line and character-level diff highlighting.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512, and bcrypt hashes. Runs entirely in your browser.

Slug Generator

SEO-friendly URL slugs from titles — separators, max length, stop words, bulk lines, URL preview.

Password Generator

Cryptographically random passwords — length, charset, ambiguous exclusion, entropy estimate, batch copy.

World Clock

Compare current times across multiple timezones with a scrollable 24-hour view. DST-aware.

Why DesertEBS

DesertEBS is built for developers, technical writers, and operators who need dependable utilities without accounts or opaque backends. Each page does one job—validate data, transform encodings, compare revisions, derive fingerprints, or align on time—so you stay in flow.

Privacy · Browser-only processing

Every tool runs in your browser with JavaScript. Text, files, JSON, Markdown, generated passwords, and computed hashes stay on your device—nothing is uploaded for analysis or storage. After load, many utilities work offline; cryptography uses the Web Crypto API or audited libraries (bcrypt runs in a worker), not a remote service.

Verify anytime: open DevTools → Network while using a tool and confirm your input never leaves the browser. No accounts means no activity profile tied to your identity.

Data & documents

JSON formatter and validator for API payloads and configs—with tree view and syntax highlighting. Markdown preview with GitHub-flavored rendering, live preview, and export for READMEs and technical notes.

Encoding & transport

Base64 and URL encoders/decoders for headers, query strings, data URIs, and embedded assets. PDF ↔ Base64 for moving small documents through JSON, HTML, and clipboard workflows without a server hop.

Review & integrity

Diff checker with line- and character-level highlights for code and copy. Hash generator: MD5, SHA family for integrity, plus bcrypt locally to illustrate password-hash behavior at different cost factors.

Publishing & collaboration

Slug generator for SEO-friendly paths. Password generator with cryptographically strong randomness from the browser. World clock with multiple IANA zones and DST-aware comparison for distributed teams.

✓No signup required✓Runs in your browser✓No data sent to our servers✓Always free