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Base64 Конвертер

Encode and decode Base64 strings for data transmission. Free online Base64 converter for binary data and API payloads.

Base64 Конвертер is a free online разработчик tool that works right in your browser — whatever you enter is processed locally and never sent to a server. No installation, no signup; works on both phone and desktop, ready to use instantly.

Инструменты для разработчиков с подсветкой синтаксиса, валидацией в реальном времени и форматированием. Полная поддержка JSON, XML, YAML, SQL и других форматов.

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How to use

  1. 1 Откройте страницу инструмента Base64 Конвертер.
  2. 2 Вставьте текст, URL или данные в область ввода.
  3. 3 Выберите режим работы и параметры.
  4. 4 Запустите инструмент и просмотрите результат.
  5. 5 Скопируйте или скачайте результат.

Why we built this tool

As developers ourselves, we kept switching between scattered tools that sent our code to unknown servers. We built this developer suite so formatting, validation, and conversion all run locally — your code stays yours.

About Base64 Конвертер: what you should know

Developers handling JWTs, SSO tokens, binary data in web contexts, or email attachments. Base64 is everywhere in modern web stacks — it encodes OAuth client secrets, data URIs for inline images, and file uploads to APIs that expect string payloads instead of multipart form data.

Key features

  • Text ↔ Base64 with UTF-8 Awareness — Unicode characters, emoji, and accented letters all encode and decode correctly. Traditional ASCII-only converters silently corrupt non-English strings — this one handles the full UTF-8 range.
  • File-to-Base64 Data URI — Drag an image or document and get a complete `data:image/png;base64,...` string ready to paste directly into HTML or CSS. Useful for embedding small assets without an extra network round-trip.
  • JWT Header Payload Inspector — Paste a JWT token and instantly see the decoded header and payload JSON — great for quickly verifying which claims (issuer, expiry, audience) are present without spinning up a JWT debugging service.

Common use cases

  • Building Data URI Inline Assets — Inline small SVG icons or favicons into a single CSS file to reduce HTTP requests during initial page load. Base64-encode the file first, then wrap it with the correct data URI prefix.
  • Encoding OAuth Client Secrets — Many OAuth providers send client_id:client_secret pairs as Base64-encoded Basic Auth credentials. Encode the pair on this tool before hitting the /token endpoint — saves you from wrestling with curl headers manually.

Часто задаваемые вопросы

Этот инструмент бесплатный?

Да, полностью бесплатный и без регистрации.

Можно использовать на мобильном?

Да, работает в мобильных браузерах с поддержкой касания.

К какой категории он относится?

Разработчик

Какие форматы языков программирования поддерживаются?

Поддерживаются JSON, XML, YAML, SQL, CSV, TOML и другие, а также конвертация форматов кода для Java, Python, TypeScript и т.д.

What code and data formats are supported for formatting and validation?

ToolPure supports JSON, XML, YAML, TOML, CSV, SQL, and Markdown formatting. Validation includes syntax checking, schema validation for JSON, and well-formedness checking for XML.

Can I convert between different data formats?

Yes, you can convert between JSON, XML, YAML, CSV, and TOML. The converter preserves data types, nested structures, and array indices during conversion.

Is there a file size limit for code formatting?

Files up to 10MB can be formatted without issues. For larger files, the tools use Web Workers to prevent UI freezing. Syntax highlighting supports files with up to 100,000 lines.

Is Base64 Конвертер safe? Is my data uploaded or stored?

Yes. Base64 Конвертер is a pure front-end tool: whatever you type or paste is processed only in your browser's memory and never sent to a server. It disappears as soon as you refresh or close the page.

🔒 Privacy & Security：All processing happens locally in your browser. Files are never uploaded or stored.

🔒 Privacy: All processing happens locally in your browser. Your files and data never leave your device — no upload, no server, no tracking.

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