Toolstack
Your Base64 data stays in your browser. Client-side only

Free Online Developer & Daily Tools

Fast, client-side web tools for PDF, image optimization, text encoding, JSON validation, and everyday calculations. Zero cloud uploads.

100% Client-Side Privacy

Your files and text never leave your device.

Instant Execution

Sub-second local browser computing.

No Account Required

Completely free with unlimited usage.

Text & Writing Tools

Real-time text analysis, word counting, and character inspection.

New

Word Counter

Count words, characters (with & without spaces), sentences, and paragraphs in real time with reading speed estimates.

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PDF & Documents

Compress, decode, and optimize documents 100% locally in your browser.

New

PDF Compressor

Reduce PDF file sizes for email attachments and uploads with zero cloud storage.

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Base64 File Decoder

Reconstruct PDF documents, audio, and binary files from raw Base64 strings.

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Image Utilities & Converters

Compress, resize, and convert images client-side without quality loss.

New

Image Compressor & Resizer

Compress and resize JPG, PNG, and WebP photos in batch with live savings metrics.

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Popular

HEIC to JPG Converter

Convert Apple iPhone HEIC and HEIF photos to high-quality JPG directly in your browser.

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Base64 to Image

Render Base64 strings and Data URIs into previewable PNG, JPEG, and WebP images.

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Image to Base64

Convert image files into Base64 strings, CSS background-image code, and Data URIs.

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Developer Utilities & Encoders

Compliant RFC 3986, RFC 8259, and RFC 4648 tools for software engineers and APIs.

Essential

URL Encoder & Decoder

Percent-encode and decode query parameters, special characters, and full URIs in real time.

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JSON Validator & Formatter

Format, validate, minify, and auto-fix JSON syntax errors with line/column diagnostics.

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Base64 Decoder

Decode Base64 strings to UTF-8 text with international Unicode and emoji support.

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Base64 Encoder

Convert text, code, and Unicode into standard Base64 and URL-safe Base64URL strings.

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Base64 Converter

Convert seamlessly between Base64, raw Hexadecimal bytes, and plain text formats.

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Base64URL Decoder

Decode web-safe tokens (- and _) and inspect JSON Web Token (JWT) payloads.

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New

UUID Generator (v4 & v7)

Generate cryptographically random UUID v4 and sortable UUID v7 identifiers with bulk export.

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Unix Timestamp Converter

Convert seconds, milliseconds, and ISO dates with a live epoch clock and timezone tools.

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New

Hash Generator & Checksum

Compute SHA-256, SHA-512, MD5, and HMAC digests for text or files locally without uploads.

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New

JWT Decoder

Safely inspect JSON Web Token header, payload claims, and expiration countdown client-side.

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New

Case Converter

Transform text across UPPERCASE, lowercase, camelCase, snake_case, kebab-case, and Title Case.

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Everyday Calculators & Math

Instant calculations for dining, group bill splitting, and tipping.

Tip Calculator & Bill Splitter

Calculate tip percentages, split restaurant checks among friends, and round up totals.

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Frequently Asked Questions

Clear, concise answers to common questions about Base64 decoding, encoding, and specifications.

Toolstack provides four primary categories: PDF & Document optimization, Image Converters & Resizers (JPG, PNG, WebP, HEIC), Developer Utilities (Base64, URL Encoder, JSON Validator), and Everyday Calculators & Word Counters.