Privacy-first · Client-side runtime 106 tools · 14 sets

106 tools that run entirely in your browser.

Document conversion, media processing, image editing and cryptography — all executed locally. Your files are never uploaded, logged, or seen by a server. Ever.

#	Tool	Path	In	Out	Max	Note
01	Audio Transcriber	ai/audio-transcription	—	—	—	Transcribe audio files to text locally in your browser. Powered by Whisper AI	Spotlight
02	Run AI in the browser	ai/browser-based-ai-chat	—	—	—	Chat with open language models that download once and then run on your own GPU, inside the browser. No…
03	Generate AI Images	ai/generate-ai-images	—	IMAGE/*	—	Turn a text prompt into an image with a diffusion model that runs on your own GPU or CPU, inside your…	Spotlight

#	Tool	Path	In	Out	Max	Note
01	Invoice Builder	document/create-invoices	—	—	—	Create professional invoices with SI-UBL and UBL 2.1 support. Generate PDFs, Excel files, and XML exports…
02	CSV to JSON Converter	document/csv-to-json	CSV	JSON	50MB	Convert CSV files to JSON format with customizable structure options. Choose between array of objects or…
03	CSV to XLSX Converter	document/csv-to-xlsx	CSV	VND.OPENXMLFORMATS-OFFICEDOCUMENT.SPREADSHEETML.SHEET	50MB	Convert CSV files to Excel XLSX format
04	JSON to CSV Converter	document/json-to-csv	JSON	CSV	50MB	Convert JSON files to CSV format with customizable delimiter options. Supports both array of objects and…
05	JSON to XLSX Converter	document/json-to-xlsx	JSON	VND.OPENXMLFORMATS-OFFICEDOCUMENT.SPREADSHEETML.SHEET	50MB	Convert JSON files to Excel XLSX format. Supports both array of objects and array of arrays JSON structures…
06	Markdown Editor & Live Preview	document/markdown-editor	—	—	—	Write Markdown with a live side-by-side preview, a rich formatting toolbar, tables, images, and task lists
07	Spreadsheet Converter	document/spreadsheet-converter	MIXED	MIXED	50MB	Convert between CSV, XLSX, and JSON formats with customizable options. High-quality conversion with live…	Spotlight
08	Text Analysis Tool	document/text-analysis	—	—	—	Comprehensive text analysis with readability scores, keyword density, and detailed metrics. Analyze word…
09	Write — Fix, Translate & Rewrite Text Privately	document/write	—	—	—	Uses your browser’s own built-in AI when it has it, and a small on-device model when it does not. Nothing you…
10	XLSX to CSV Converter	document/xlsx-to-csv	MIXED	CSV	50MB	Convert Excel XLSX files to CSV format
11	XLSX to JSON Converter	document/xlsx-to-json	MIXED	JSON	50MB	Convert Excel XLSX files to JSON format with customizable structure options. Choose between array of objects…

#	Tool	Path	In	Out	Max	Note
01	Add Page Numbers to PDF	pdf/add-page-numbers	PDF	PDF	1GB	Stamp page numbers onto a PDF — choose the format, position, starting number, size, and color
02	Compress PDF	pdf/compress-pdf	PDF	PDF	1GB	Reduce PDF file size in your browser. Smart compression shrinks embedded images while keeping text selectable…	Spotlight
03	Delete PDF Pages	pdf/delete-pages	PDF	PDF	1GB	Remove unwanted pages from a PDF
04	Extract PDF Pages	pdf/extract-pages	PDF	PDF	1GB	Pick the pages you want and save them as a new PDF
05	Fill and Sign PDF	pdf/fill-and-sign	PDF	PDF	1GB	Fill in a PDF form and add your signature — type text, draw or place a signature, then download
06	JPG to PDF	pdf/jpg-to-pdf	IMAGE/*	PDF	1GB	Convert JPG, PNG, and WebP images into a single PDF	Spotlight
07	Merge PDF	pdf/merge-pdf	PDF	PDF	1GB	Combine multiple PDFs into one file	Spotlight
08	Organize PDF Pages	pdf/organize-pdf	PDF	PDF	1GB	Visually reorder, rotate, and delete PDF pages — drag and drop across one or more files, then download
09	PDF Editor	pdf/pdf-editor	PDF	PDF	1GB	Annotate, draw, highlight, add text and images to a PDF — then flatten to a new file	Spotlight
10	PDF to JPG	pdf/pdf-to-jpg	PDF	JPEG	1GB	Convert each PDF page to a high-quality JPG image
11	PDF to PNG	pdf/pdf-to-png	PDF	PNG	1GB	Convert each PDF page to a crisp, lossless PNG image
12	PDF to Text	pdf/pdf-to-text	PDF	PLAIN	1GB	Extract all the selectable text from a PDF
13	Protect PDF	pdf/protect-pdf	PDF	PDF	500MB	Password-protect a PDF with strong AES-256 encryption, right in your browser
14	Rotate PDF	pdf/rotate-pdf	PDF	PDF	1GB	Turn sideways or upside-down pages the right way up
15	Split PDF	pdf/split-pdf	PDF	PDF	1GB	Split one PDF into several — by page ranges, every N pages, or one file per page	Spotlight
16	Unlock PDF	pdf/unlock-pdf	PDF	PDF	500MB	Remove a password you know from a PDF, right in your browser
17	Watermark PDF	pdf/watermark-pdf	PDF	PDF	1GB	Add a text watermark to every page — centered or tiled, with adjustable opacity, size, angle, and color

#	Tool	Path	In	Out	Max	Note
01	Audio Converter	media/audio-converter	MIXED	MIXED	200MB	Convert audio files between different formats including MP3, WAV, FLAC, AAC, OGG, and M4A. High-quality…	Spotlight
02	BPM Detector	media/bpm-detector	MIXED	—	1GB	Find the tempo of any track in your browser. Drop an MP3, WAV or FLAC and get the BPM to a tenth, with the…
03	Compress Video	media/compress-video	VIDEO/*	VIDEO/*	1GB	Compress and resize video files to reduce file size while maintaining quality. Choose from preset compression…	Spotlight
04	Extract Audio from Video	media/extract-audio-from-video	VIDEO/*	MIXED	500MB	Extract high-quality audio tracks from video files and save them in your preferred audio format including…	Spotlight
05	Audio HLS Stream Generator	media/hls-audio-generator	MIXED	HLS (M3U8 + TS SEGMENTS)	500MB	Convert audio files to HLS (HTTP Live Streaming) format with multiple quality variants for adaptive audio…	Spotlight
06	HLS Stream Generator	media/hls-generator	VIDEO/*	HLS (M3U8 + TS SEGMENTS)	1GB	Convert video files to HLS (HTTP Live Streaming) format with multiple quality variants for adaptive streaming	Spotlight
07	Key & Camelot Finder	media/key-finder	MIXED	—	1GB	Find the musical key of any track and see it on the Camelot wheel, with the three keys that mix into it…
08	LUFS Loudness Meter	media/lufs-meter	MIXED	—	1GB	Measure integrated loudness, loudness range and true peak to the EBU R128 and ITU-R BS.1770-4 standards, with…
09	Video & Audio Viewer	media/media-viewer	MIXED	MIXED	2GB	Play video and audio of virtually any format directly in your browser — MP4, MKV, AVI, MOV, WMV, FLV, MP3…
10	Spectrogram Viewer	media/spectrogram	MIXED	—	1GB	See any audio file as a spectrogram on a log frequency axis, built in your browser. The straight edge near…
11	Spectrum Analyser	media/spectrum-analyzer	MIXED	—	1GB	A live spectrum analyser in your browser. Use your microphone or drop a file, and watch the frequency balance…
12	Tap Tempo	media/tap-tempo	—	—	—	Tap along and read the tempo. The median of the last eight intervals, timed with a monotonic clock, with…
13	Instrument Tuner	media/tuner	MIXED	—	1GB	A chromatic instrument tuner in your browser. YIN pitch detection follows the period rather than the loudest…
14	Video Converter	media/video-converter	MIXED	MIXED	500MB	Convert video files between multiple formats including MP4, WebM, AVI, MOV, MKV, and more. High-quality…	Spotlight
15	Browser Video Crop & Time Stretch	media/video-crop-time-stretch	MIXED	MIXED	300MB	Crop, trim and change the speed of any video right in your browser. Drag a crop box, time-stretch with pitch…	Spotlight
16	Waveform & Peak Viewer	media/waveform-viewer	MIXED	—	1GB	See any audio file's waveform at true full scale — never normalised, so two files can be compared — with…

#	Tool	Path	In	Out	Max	Note
01	CSS Grid Generator	developer/css-grid-generator	—	—	—	Build advanced CSS Grid layouts visually — drag tracks, place and span items, paint named…
02	Favicon Generator	developer/favico	MIXED	MIXED	50MB	Generate favicons for your website in multiple formats and sizes. Create ICO, PNG, and touch icons for all…
03	Flexbox Generator	developer/flexbox-generator	—	—	—	Build CSS Flexbox layouts visually — set direction, wrap, alignment and gaps, tune each item's grow, shrink…
04	HTML Editor & Live Preview	developer/html-editor	—	—	—	Write HTML in a VS Code-class editor or a rich visual editor, with a live side-by-side preview you can resize…
05	Regex Tester & Live Preview	developer/regex-tester	—	—	—	Build and debug regular expressions with instant, side-by-side highlighting. Hover any match to link the code…
06	Webfont Converter	developer/webfont	MIXED	FONT/*	50MB	Convert font files between multiple formats including TTF, OTF, WOFF, and WOFF2. High-quality conversion with…

#	Tool	Path	In	Out	Max	Note
01	AES File & Text Encryptor	security/aes-encryptor	MIXED	MIXED	—	Use a generated key or a password, save the key as a file, and bundle several files into one encrypted…
02	Base64 Decode	security/base64-decode	—	—	—	Decode a Base64 string back to readable text in two linked panes — edit either side and the other follows…
03	Base64 Encode	security/base64-encode	—	—	—	Encode text to Base64 in two linked panes — edit either side and the other follows. Standard or URL-safe…
04	CSR Generator	security/csr-generator	—	—	—	Build a certificate signing request in your browser with RSA 2048/3072/4096 or ECDSA P-256/P-384, subject…
05	DER to PEM Converter	security/der-to-pem	MIXED	MIXED	10MB	Convert certificates and keys from binary DER to PEM text with BEGIN and END lines, block by block so a chain…
06	Hash Generator	security/hash-generator	MIXED	PLAIN	100MB	Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 for text or a file in one pass, then check the result…
07	JWT Sign	security/jwt-sign	—	—	—	Build a JSON Web Token and sign it with HS256, HS384 or HS512 and a shared secret. The secret is used in your…
08	JWT Verify	security/jwt-verify	—	—	—	Paste a token and read its header and payload without a secret. Add the shared secret and the signature is…
09	Secure Password Generator	security/password-generator	—	PLAIN	0	Generate five passwords at once, each with its entropy in bits, from a length and character sets you choose…
10	PEM to DER Converter	security/pem-to-der	MIXED	MIXED	10MB	Convert certificates and keys from PEM text to binary DER, block by block so a chain stays a chain. The…
11	PGP Encryption & Digital Signatures	security/pgp	MIXED	MIXED	50MB	Encrypt, decrypt, sign and verify with OpenPGP in your browser, on openpgp.js. Generate a Curve25519 or RSA…
12	PGP Decrypt File	security/pgp-decrypt-file	—	*	50MB	Decrypt an OpenPGP file with your private key, in your browser. The download is offered only after the…
13	PGP Decrypt Message	security/pgp-decrypt-message	—	TXT	—	Decrypt an OpenPGP message with your private key, in your browser. Any signature the message carried is…
14	PGP Encrypt File	security/pgp-encrypt-file	—	MIXED	50MB	Encrypt a file to one or more OpenPGP public keys in your browser. The session key is wrapped for each…
15	PGP Encrypt Message	security/pgp-encrypt-message	—	ASC	—	Encrypt text to one or more OpenPGP public keys and get back an armored block you can paste anywhere. Sign it…
16	PGP Export Keys	security/pgp-export-keys	—	ASC	—	Export a key from this browser's keyring as ASCII-armored text. The public key and the private key are always…
17	PGP Key Generator	security/pgp-generate-keys	—	ASC	—	Generate an OpenPGP key pair in your browser — Curve25519 or RSA 3072/4096, with an expiry date and a…
18	PGP Import Keys	security/pgp-import-keys	—	—	10MB	Read an OpenPGP key by pasting the block or dropping the file. A block holding several keys imports all of…
19	PGP Sign File	security/pgp-sign-file	—	MIXED	50MB	Sign a file with your OpenPGP private key in your browser. A detached signature leaves the original file…
20	PGP Sign Message	security/pgp-sign-message	—	MIXED	—	Sign text with your OpenPGP private key as a cleartext signature, an inline signed message, or a detached…
21	PGP Verify File	security/pgp-verify-file	—	—	50MB	Check a detached OpenPGP signature against the file it covers. Validity, signer, key status and signing time…
22	PGP Verify Signature	security/pgp-verify-signature	—	—	—	Check an OpenPGP signature on a message and see the facts separately: whether it is cryptographically valid…
23	Security & Cryptography Converter	security/security-converter	MIXED	MIXED	10MB	Paste anything or drop a file, and every reading the page finds is offered with a real computed result…
24	SSL Certificate Viewer	security/ssl-certificate-viewer	—	—	—	Read an X.509 certificate from PEM or DER: validity, subject, issuer, subject alternative names, key type and…
25	URL Decode	security/url-decode	—	—	—	Decode percent-encoded text in two linked panes, with three modes. A broken escape is reported with its…
26	URL Encode	security/url-encode	—	—	—	Percent-encode text in two linked panes, with three modes: a whole URL, a single query value, or form data…

#	Tool	Path	In	Out	Max	Note
01	Time Converter	time/time-converter	—	—	—	Comprehensive time conversion calculator supporting unit conversions, date-time formatting, timezone…
02	Timezone Converter	time/timezone	—	—	—	Convert times between different timezones, visualize world day/night regions, and view sunrise, sunset, and…

#	Tool	Path	In	Out	Max	Note
01	Barcode Generator	utils/barcode-generator	—	—	—	Generate various types of barcodes including Code 128, EAN, UPC, Code 39, and more. Customize appearance and…
02	Cyrillic ↔ Latin Keyboard & Converter	utils/cyrillic-latin-converter	—	—	—	Type, convert, and transliterate between Cyrillic and Latin scripts with a fully customizable on-screen…
03	Lorem Ipsum Generator	utils/lorem-ipsum-generator	—	—	—	Generate customizable placeholder text for your designs and layouts. Choose number of paragraphs, length, and…
04	QR Code Generator	utils/qr-code-generator	—	—	—	Generate QR codes for text, URLs, WiFi credentials, and more. Customize colors, size, and error correction…

#	Tool	Path	In	Out	Max	Note
01	BMI Calculator	calculate/bmi-calculator	—	—	—	Calculate your Body Mass Index (BMI) with detailed health analysis, personalized recommendations, and visual…
02	Percentage Calculator	calculate/percentage-calculator	—	—	—	Calculate percentages with multiple methods including visual charts and step-by-step solutions. Supports…
03	VAT Calculator	calculate/vat-calculator	—	—	—	Professional VAT calculator with multi-row entries, country-specific rates, and visual summaries. Supports…

#	Tool	Path	In	Out	Max	Note
01	Accessible Palette Generator	color/accessible-palette-generator	—	—	—	Generate a color palette from a base color, checked and auto-adjusted so every swatch meets WCAG contrast…
02	Accessible Text Color Finder	color/accessible-text-color-finder	—	—	—	Find a readable, WCAG-compliant text color for any background. Enter a background color and get a suggested…
03	Brand Palette Accessibility Checker	color/brand-palette-accessibility-checker	—	—	—	Check every combination in a set of brand colors against WCAG contrast requirements at once — find which…
04	Color Blindness Simulator	color/color-blindness-simulator	—	—	—	Preview how a color looks under protanopia, deuteranopia, tritanopia, and achromatopsia — check your palette…
05	Color Converter	color/color-converter	—	—	—	Convert colors between HEX, RGB, CMYK, LAB, and HSL. Enter a value or provide one in the URL — every…
06	Color Editor	color/color-editor	—	—	—	Convert between HEX, RGB, HSL, CMYK, LAB, LCH, and OKLCH, generate matching palettes, check WCAG contrast…	Spotlight
07	Complementary Color Generator	color/complementary-color-generator	—	—	—	Find the complementary color for any base color — the hue directly opposite it on the color wheel, generated…
08	Contrast Checker	color/contrast-checker	—	—	—	Check the WCAG contrast ratio between a foreground and background color for text, large text, and UI…
09	Palette Generator	color/palette-generator	—	—	—	Generate complementary, analogous, triadic, tetradic, split-complementary, and monochromatic palettes from…
10	Spot Color Approximation Tool	color/spot-color-finder	—	—	—	Find the closest match to a color in a small, generic reference swatch library — an approximate starting…
11	WCAG Color Checker	color/wcag-color-checker	—	—	—	Check whether two colors meet WCAG 2.1 accessibility requirements. Enter a foreground and background to get…

#	Tool	Path	In	Out	Max	Note
01	DNS Lookup	network/dns-lookup	—	—	—	Look up A, AAAA, MX, TXT, NS, CNAME, SOA, and CAA records for any domain — via DNS-over-HTTPS, in your browser
02	What Is My IP Address	network/ip-address	—	—	—	See your public IP address plus connection details, local network info, and browser data — all read in your…
03	Internet Speed Test	network/speed-test	—	—	—	Measure your download and upload speed, latency, and jitter — right in your browser, with no app and no…	Spotlight