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Code & Web

Encode Base64 and URLs, format HTML and CSS, preview Markdown, and validate regular expressions, links, and email addresses locally.

13 tools · 9 subcategories

Encoders

Encode Unicode text as RFC 4648 Base64 or decode percent-encoded and form-plus URL text with explicit malformed-input errors.

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Base64 Text EncoderEncode browser text as UTF-8 bytes and RFC 4648 standard Base64, with exact Unicode handling, byte count, copy, text-file import, and download. Ideal for developers preparing payloads for APIs, data URIs, email attachments, and authentication headers. Handles full Unicode range with transparent byte counting.Code & Web / EncodersTry it
Percent Encoding DecoderDecode one percent-encoded UTF-8 string locally with decodeURIComponent, treating plus signs as spaces, and report invalid escape sequences instead of returning partial output. Essential for developers debugging URL parameters, parsing form submissions, and inspecting encoded API query strings.Code & Web / EncodersTry it

Decoders

Decode standard or URL-safe Base64 into strict UTF-8 text and reject malformed alphabets or invalid byte sequences.

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Base64 UTF-8 DecoderDecode standard Base64 or unpadded Base64URL text locally, normalize whitespace and padding, reject malformed alphabet data, and require the decoded bytes to be valid UTF-8. Useful for developers, analysts, and anyone working with encoded API responses, JWT tokens, or data URLs. Supports both padded and unpadded variants with instant browser-side processing.Code & Web / DecodersTry it

File Converters

Read a selected file as bytes and create a MIME-aware Base64 data URL without uploading or altering the file.

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File to Base64 Data URL ConverterRead any user-selected local file as exact bytes and build a copyable data URL with its browser-reported MIME type and RFC 4648 Base64 payload. Perfect for embedding images, fonts, or documents directly in HTML, CSS, or JavaScript without a server. Supports drag-and-drop and file picker workflows.Code & Web / File ConvertersTry it

Encoding

Percent-encode Unicode text for URL components with encodeURIComponent rules and clearly expose every escaped byte sequence.

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RFC 3986-Style URI Component EncoderEncode an entire input string as one UTF-8 URI component with encodeURIComponent plus explicit escapes for !, apostrophe, parentheses, and asterisk. Useful for developers building query strings, constructing API URLs, and preparing user input for safe transmission in web addresses.Code & Web / EncodingTry it

Markup

Format HTML source or convert Markdown to sanitized HTML for review, copying, and safe local preview.

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HTML Formatter with PreviewIndent HTML source by 2, 4, or 8 spaces, collapse it with the minify option, and inspect the original input through a DOMPurify-sanitized sandboxed preview. Helpful for developers debugging templates, reviewing generated markup, and preparing HTML for version control diffs. Catches structural issues early.Code & Web / MarkupTry it
Markdown to HTML ViewerImport, paste, or type Markdown, convert it with Marked in GFM mode, sanitize the HTML with DOMPurify, preview it, and copy the allowed markup locally. Useful for writers, documentation authors, and developers previewing Markdown rendering with GitHub-flavored extensions.Code & Web / MarkupTry it

Markdown

Render GitHub-flavored Markdown into a sanitized local preview with protected external links and active HTML removed.

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Markdown Live PreviewWrite or import Markdown beside a live sanitized preview, toggle rendering while editing, and copy the exact allowed HTML without executing scripts or loading images. Essential for content authors, documentation writers, and developers crafting Markdown with immediate visual feedback.Code & Web / MarkdownTry it

Analysis

Measure Markdown words, characters, headings, links, fenced code blocks, paragraphs, and estimated reading time.

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Markdown Structure AnalyzerCount Markdown words, UTF-16 characters, lines, blank-line paragraphs, ATX headings, links/images, fenced code blocks, and estimated reading minutes locally. Useful for writers tracking document length, editors reviewing content scope, and developers estimating reading time for documentation.Code & Web / AnalysisTry it

Stylesheets

Reindent CSS rules, declarations, at-rules, and nested blocks into readable stylesheet source for review.

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CSS FormatterReindent simple CSS with two spaces by inserting line breaks around braces and semicolons, while showing browser stylesheet diagnostics before copy or download. Helpful for developers cleaning minified styles, reviewing auto-generated CSS, or preparing code for pull requests. Catches basic syntax issues inline.Code & Web / StylesheetsTry it

Validators

Test regular expressions and check URL or email syntax with visible match, parsing, and failure details.

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Regex TesterRegex Tester compiles JavaScript regular expressions with the selected flags and highlights matches and capture groups against the supplied sample text. Essential for developers building, debugging, and validating regular expressions for data extraction, input validation, and text transformation.Code & Web / ValidatorsTry it
URL ValidatorURL Validator parses the entered string with the workspace's URL rules and reports syntax components; it does not request or verify the destination. Essential for developers validating user-submitted links, auditing URL formats, and catching malformed addresses before processing.Code & Web / ValidatorsTry it
Email ValidatorScreen one trimmed address with the workspace's simple pattern: non-space text, one @ separator, a dot in the domain portion, and at least two trailing non-space characters. Useful for form validation, data cleanup, and quick sanity checks before sending. Note: this is syntax checking only, not mailbox existence verification.Code & Web / ValidatorsTry it
Are these tools private and available offline?

Processing happens locally in browser memory. After the application has been cached, supported tools can continue working offline without sending your input to a server.

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