免费在线文本工具

Free online word counter. Instantly count words, characters, sentences, paragraphs, and reading time. No upload — your text stays in your browser.

Free online character counter — counts letters, digits, punctuation, whitespace, and total characters with full unicode support.

Remove duplicate lines from text or lists. Case-insensitive and trim options. Browser-based, free, no uploads.

Sort lines alphabetically, by length, or numerically. Ascending or descending, case-insensitive, with empty-line removal.

Convert text between uppercase, lowercase, sentence case, and toggle case. Free, browser-based, instant.

Find and replace text online — plain or regex, case-sensitive or insensitive. Free, browser-based, real-time.

Encode text to Base64 or decode Base64 to text. UTF-8 / unicode safe. Free, browser-based, no upload.

Generate Lorem Ipsum placeholder text — by words, sentences, or paragraphs. Browser-based, instant, copy-friendly.

Generate strong random passwords with letters, numbers, symbols. Cryptographically secure, runs entirely in your browser.

Percent-encode or decode URLs and query strings. Component or full-URL mode. Browser-based, instant.

Pull all email addresses out of any text. Deduplicate, lowercase, and copy as a list. Browser-based and private.

Pull all URLs out of any text — http, https, and www. Deduplicate and copy as a list. Browser-based.

Compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text. Runs entirely in your browser via Web Crypto API.

Flip text upside down using Unicode look-alikes. Paste anywhere — social media, messages, names. Free.

Convert text to Unicode bold, italic, monospace, small caps, or fullwidth. Use anywhere Unicode is supported.

Remove HTML tags from any markup and return clean plain text. Decodes entities, removes scripts and styles.

Pick one or more random lines from your list. Optional uniqueness and skip-empty modes. Browser-based RNG.

Prepend or append text to every line — make bullet lists, SQL value lists, quoted strings.

Strip leading and trailing whitespace from text. Per-line mode. Optional collapse of repeated spaces.

Count how many times a word, phrase, or regex appears in text. Case-insensitive, overlapping options.

Browser-based WYSIWYG HTML editor with formatting toolbar and live HTML source view. Paste rich text, edit, copy clean HTML.

Format, minify, and validate JSON instantly. 2/4-space or tab indent. Shows precise error location. Runs in your browser.

Convert Markdown to clean HTML with live preview. Supports headings, lists, links, code blocks, blockquotes, emphasis.

Compare two blocks of text line by line. See added, deleted, and unchanged lines highlighted. Browser-based.

Generate UUIDs — v4 (random) or v7 (time-ordered, sortable). Bulk generation, uppercase, brace-wrapped formats.

Analyze keyword frequency and density in any text. Filter stop words, set min length, show top N. For SEO and content analysis.

Decode JSON Web Tokens (JWT) in your browser. View header, payload, and expiry. Signature shown but not verified.

Convert CSV to JSON (array of objects) or JSON to CSV. Custom delimiter, header detection, quoted fields supported.

Resize JPG, PNG, or WebP images to any dimensions. Keep aspect ratio. Choose output format. Runs in your browser.

Compress JPG, PNG, or WebP photos. Adjust quality, set max width, see size savings. Browser-based, no upload.

Crop any image by drag-selecting a region. Outputs PNG, JPEG, or WebP. Browser-based, no upload.

Convert images between PNG, JPEG, and WebP formats. Adjust quality for JPEG/WebP. Browser-based, instant.

Combine multiple PDFs into one. Drag-to-select multiple files. Runs entirely in your browser via pdf-lib.

Rotate PDF pages 90°, 180°, or 270°. Apply to all pages or specific page ranges. Browser-based, no upload.

Convert one or more JPG, PNG, or WebP images into a single PDF. A4/Letter/Legal page sizes. Browser-based.

Generate random strings of any length using letters, digits, and symbols. Powered by crypto.getRandomValues — produces multiple strings at once.

Paste two lists and see which items are common, which are unique to A, which are unique to B, and the combined union — all in your browser.

Rotate any image by 90°, 180°, 270°, or any arbitrary angle. Browser-based, no upload, exports as PNG/JPG/WebP.

Apply Instagram-style filters to any image: grayscale, sepia, blur, brightness, contrast, saturation, hue-rotate, invert.

Split a PDF into separate files by page ranges, or extract every N pages. Outputs a zip of multiple PDFs. Browser-based.

Reduce PDF file size with lossless re-encoding. Shows before/after sizes. Browser-based, no upload.

Add a text watermark to every page of a PDF. Tune text, opacity, rotation, color, and position. Browser-based.

Test JavaScript regular expressions live — highlights matches in your text and lists captured groups. All flags supported.

Convert between HEX, RGB, HSL, and RGBA color formats. Live color picker, all formats stay in sync. Browser-based.

Compare two JSON values structurally. Shows added, removed, and changed keys with full paths. Browser-based.

Build cron expressions with a 5-field editor. See plain-English description and the next 5 fire times in your local timezone.

Paste any CSV and see it as a clean, scrollable table. Auto-detects delimiter. Browser-based, no upload.

Filter CSV rows by column value — contains, equals, regex, numeric compare. Browser-based, no upload.

Remove duplicate rows from a CSV by full row or by selected columns. Case-insensitive and trim options.

Per-column statistics for any CSV: count, non-empty, unique, numeric count, min, max, mean, sum.

Paste a list and get back each unique value with a count of how many times it appeared. Sorted by frequency.

Generate a privacy policy template for your website. GDPR / CCPA options. Browser-based, instant, downloadable HTML.

Generate a terms-of-service template for your website. Optional sections for payments, refunds, user content, DMCA, arbitration.

Build a robots.txt file with allow / disallow rules per user-agent, crawl-delay, and sitemap URL. Browser-based.

Generate SEO meta tags + Open Graph + Twitter Card tags for any page. Live SERP preview. Browser-based.

Generate color palettes from a base color — complementary, analogous, triadic, tetradic, monochromatic, shades, tints. Live swatches + CSS variables export.

Visual CSS gradient builder. Linear, radial, conic. Unlimited color stops, live preview, one-click copy of the CSS.

Build Markdown tables visually — click cells to edit, set alignment, import from CSV. Live preview and copy.

Build a professional email signature with name, title, contact, social, and optional logo. Outputs Gmail/Outlook-compatible HTML.

Extract plain text from a .docx Word document. Browser-based, no upload — your file never leaves your device.

Convert .docx Word documents to clean HTML — preserves headings, bold/italic, lists, links, tables. Browser-based.

Convert Excel .xlsx (or .xls, .ods) spreadsheets to CSV. Pick any sheet, choose delimiter, download a single sheet or zipped all sheets.

Convert Excel sheets to JSON — array of objects (keyed by header) or array of arrays. Browser-based, no upload.

Convert CSV files to Excel .xlsx. Pick delimiter, sheet name, and output filename. Browser-based, no upload.

Extract visible text and speaker notes from a .pptx PowerPoint deck. Slide-by-slide output. Browser-based.

Drop a CSV and filter, sort, bulk-update, visualise and export — all in one browser-based studio. No upload, no signup.

Generate custom QR codes for URLs, text, Wi-Fi, vCards and more. Choose colors, size and error correction. Download SVG or PNG — 100% client-side.

Extract all text from a PDF file. Page-by-page output, optional line-break preservation. Browser-based, no upload, no signup.

Check WCAG 2.1 contrast ratio between two colors. AA & AAA pass/fail for normal and large text. Live preview, swap, invert.

Format SQL queries — supports PostgreSQL, MySQL, BigQuery, Snowflake, T-SQL and more. Pick keyword case, indent, and dialect. Minify too.

Format, validate, and convert YAML — pretty-print, sort keys, convert YAML ↔ JSON. Browser-based, no upload.

Paste JSON, get clean TypeScript interfaces (or type aliases). Optional readonly, optional props, custom root name.

Paste a cron expression, get a human-readable description, a field-by-field breakdown, and the next 10 scheduled runs in your local time.

Convert .docx Word documents to PDF — A4 / Letter / Legal pages, custom font size, optional page numbers and filename header. 100% browser-based.

Convert Excel .xlsx (or .xls, .ods) spreadsheets to PDF. Each sheet on its own landscape page with grid borders. Browser-based.

Convert .pptx PowerPoint presentations to PDF — one slide per landscape page, optional speaker notes. Text-only conversion, browser-based.

Remove lines containing — or NOT containing — any of several text patterns. Stack multiple filters (contains, starts-with, ends-with, regex, empty). Browser-based.

Move pages up, down, to top, to bottom, or remove individual pages. Save the reordered PDF — 100% browser-based.

Delete one or more specific pages from a PDF — supports ranges like 2,5-8. Browser-based, no upload.

Edit a PDF's metadata: title, author, subject, keywords, creator, producer. Or strip all metadata for privacy. Browser-based.

Combine 2, 4, 6 or 9 PDF pages onto a single sheet for printing. Browser-based.

Overlay an image (logo, signature, watermark) onto every page of a PDF. Pick position, size and opacity. Browser-based.

Convert every page of a PDF to A4, Letter, Legal, A3, A5, or a custom size. Optional aspect-ratio preservation.

Add custom header / footer text to every page of a PDF. Supports current-page and total-pages placeholders, position, color, skip cover page.

Insert blank pages between existing PDF pages — after every page, after odd pages, before specific pages, or at start/end. Browser-based.

Drop one source image and download all required iOS, Android, Google Play Store and favicon sizes packaged as a ZIP — 100% in your browser.

Drop an image, get wallpapers sized for iPhone, iPad, Android phone, Android tablet and desktop — JPEG / PNG / WebP, packaged as a ZIP.

Create Open Graph (1200×630), Twitter, LinkedIn, square and story images with a title, subtitle and optional logo — live preview, PNG download.

Convert Markdown to a clean, paginated PDF — headings, lists, blockquotes, code blocks. Optional table of contents and page numbers.

Convert HTML to PDF — open in a print preview for high-fidelity output, or download a smaller text-only PDF. Browser-based, no upload.

Trim white edges from every page of a PDF. Percentage or absolute trims, per-edge control, apply to all/odd/even pages. Browser-based.

Draw a signature on a canvas (mouse or touch) or upload a signature image, then stamp it onto any page of a PDF. Browser-based, private.

Extract the plain text of every chapter from an .epub e-book. Spine-ordered, optional chapter headers. Browser-based, no upload.

Convert .epub e-books to a single HTML document — preserves chapter structure, optional inline styles stripping, live preview.

Design 1280×720 YouTube thumbnails — background image + bold title overlay + theme presets + optional MUST WATCH badge. Live preview.

Slice one wide image into 2–10 Instagram carousel slides (square, 4:5 portrait, or 9:16 story). Cover or overlap modes. ZIP download.

Resize + auto-compress images to fit Discord (≤256 KB), Slack (≤128 KB), or Telegram emoji limits. PNG / WebP / JPEG, browser-based.

Generate Shields.io-style SVG badges for GitHub READMEs. Custom labels, colors, styles (flat / square / for-the-badge / plastic). Download SVG.

Trim any audio file (MP3, WAV, OGG, M4A, FLAC) to a chosen start–end range with optional fade in/out. Exports WAV. Browser-based.

Boost (or attenuate) any audio file to a target peak / RMS level. Exports lossless WAV. Browser-based.

Render every PDF page to PNG, JPEG or WebP at chosen DPI. Browser-based via pdf.js, packaged as a ZIP.

Extract text from screenshots, scans, photos. 10 languages supported. Powered by Tesseract.js — runs entirely in your browser.

Convert many PNG / JPEG images to modern WebP or AVIF in one batch. Resize, set quality, download as ZIP.

Convert a CSV to SQL INSERT statements for MySQL, PostgreSQL, SQLite or MS SQL. Optional CREATE TABLE, multi-value INSERT mode.

Convert JSON (array of objects, array of arrays, single object) to CSV. Optional nested-object flattening with dot notation.

Build & sign JSON Web Tokens client-side using HMAC SHA-256, 384, or 512. Web Crypto API — your secret never leaves your browser.

Encode and decode Base32 (RFC 4648), Base32-hex, and Base58 (Bitcoin / IPFS) entirely in your browser.

Generate placeholder Markdown — paragraphs, headings, lists, code blocks, blockquotes. Picks: classic Lorem, tech, foodie, hipster.

Look up the MIME type for any file extension (or reverse: find extensions for a MIME). 90+ types covered.

Upload a PDF, click or drag where to sign, then draw / type / upload your signature or pick a preset stamp. 100% browser-based.

Drop an image, click where to sign, then draw / type / upload a signature image. Browser-based, exports PNG.

Add APPROVED, DRAFT, CONFIDENTIAL or custom text stamps to every page of a PDF. Boxed or plain, diagonal or fixed position.

Paste JSON and instantly generate Go struct definitions with json struct tags, omitempty, and pointer-for-optional support. Runs entirely in your browser.

Generate a JSON Schema (draft 2020-12, 2019-09, or draft-07) from a JSON sample — with auto-detected types, examples, and format hints (email, uri, date-time).

Convert a JSON sample to a Zod schema with TypeScript type inference — auto-detects email, url, uuid, datetime, and integer fields.

Paste HTML and get clean Markdown — headings, links, lists, blockquotes, tables, fenced code blocks. Browser-based, no upload.

Create a wa.me click-to-chat link with optional pre-filled message and a QR code — perfect for bios, business cards, and email signatures.

Combine multiple images into one — vertical stack, horizontal row, or grid. Drag, drop or paste from clipboard. Custom gap, background color, PNG/JPEG/WebP output.

Calculate your daily calorie requirements and target macronutrient distribution (protein, fats, carbs) based on your fitness goals and BMR. Free and interactive.

Calculate recommended daily allowances (RDAs) for key vitamins and minerals based on age, gender, and life stage. Check food sources.

Track your weekly training volume per muscle group. Calculate sets, reps, total volume load, and evaluate training against hypertrophy guidelines.

免费的在线音频变调与变速工具。可按半音调整音频音高，或在本地改变播放速率。无需上传，安全且即时生效。

免费在线音频倒放工具。上传任何音频文件，在浏览器本地实现倒放，并下载无损倒放 WAV 格式音频。

免费的在线文本差异对比工具。支持双栏左右对照，精准高亮显示行级别差异以及字符级别的添加和删除。

免费在线 App Store 和应用商店截图制作工具。将您的移动应用界面装入 iPhone 或 Pixel 手机边框中，搭配渐变背景和精美文案标题。