Free Online Converters

Image, Audio, Video, PDF and Unit Converters That Run in Your Browser

Every converter on the site in one place. Change a measurement from one unit to another with the exact factor shown, turn a HEIC photo into a JPG, a WAV into an MP3, a web page into a PDF or a Unix timestamp into a date. File conversions run on your own device, so nothing is uploaded and the result downloads straight back to you.

Most used this week

Image Converter

Convert HEIC, TIFF, PSD, WebP and more to PNG, JPG, WebP or AVIF.

Audio To CSV/JSON

Export raw audio samples as CSV or JSON for analysis.

FPS Converter

Convert a video to a different frame rate, keeping its speed.

IP Range To CIDR Converter

Turn start and end IP addresses into the fewest CIDR blocks.

Image Converter

Convert HEIC, TIFF, PSD, WebP and more to PNG, JPG, WebP or AVIF.

Audio To CSV/JSON

Export raw audio samples as CSV or JSON for analysis.

Units 47

Length, weight, temperature, volume, area, speed, energy and data, with exact factors.

Bytes To KB

Convert bytes to kilobytes: divide by 1,000, or 1,024 for binary.

Celsius To Fahrenheit

Convert Celsius to Fahrenheit with the exact formula.

Cm To Inches

Convert centimetres to inches with the exact factor.

Cubic Metres To Cubic Feet

Convert cubic metres to cubic feet with the exact factor.

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Cups To Grams

Cups to grams for any ingredient, in US, metric or imperial cups.

Cups To Ml

Convert US cups to millilitres: multiply by 236.59.

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Degrees To Radians

Convert degrees to radians: multiply by π/180.

Feet To Cm

Convert feet to centimetres: multiply by 30.48.

File Size Converter

Convert any file or drive size into every decimal and binary unit at once.

GB To GiB

Convert decimal gigabytes to binary gibibytes: multiply by 0.9313.

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GB To MB

Convert gigabytes to megabytes: multiply by 1,000, or 1,024 for binary.

GB To TB

Convert gigabytes to terabytes: divide by 1,000, or 1,024 for binary.

Grams To Ounces

Convert grams to ounces with the exact factor.

Hectares To Acres

Convert hectares to acres with the exact factor.

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Inches To Feet

Convert inches to feet: divide by 12.

Joules To Calories

Convert joules to calories: divide by 4.184.

Joules To KWh

Convert joules to kilowatt-hours: divide by 3.6 million.

KB To MB

Convert kilobytes to megabytes: divide by 1,000, or 1,024 for binary.

KJ To Calories

Convert kilojoules on a food label to calories: divide by 4.184.

Kelvin To Celsius

Convert kelvin to Celsius by subtracting 273.15.

Kelvin To Fahrenheit

Convert kelvin to Fahrenheit with the exact formula.

Kg To Lbs

Convert kilograms to pounds with the exact factor.

Kg To Stone

Convert kilograms to stone and pounds.

Km To Miles

Convert kilometres to miles with the exact factor.

Km/h To Knots

Convert kilometres per hour to knots with the exact factor.

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Km/h To Mph

Convert kilometres per hour to miles per hour with the exact factor.

Knots To Mph

Convert knots to miles per hour with the exact factor.

Length Converter

Convert between metric and imperial lengths.

Litres To Gallons

Convert litres to US gallons with the exact factor.

M/s To Km/h

Convert metres per second to kilometres per hour: multiply by 3.6.

ML To Fl Oz

Convert millilitres to US fluid ounces with the exact factor.

Mbps To MB/s

Convert Mbps to MB/s: divide by 8.

Metres To Feet

Convert metres to feet with the exact factor.

Metres To Yards

Convert metres to yards with the exact factor.

Oven Temperature Converter

Celsius, fan, Fahrenheit and gas mark oven temperatures, any direction.

Pixels To Inches

Pixels to inches or cm and back, at the DPI you choose.

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Pounds To Stone

Convert pounds to stone: divide by 14.

Print Size Calculator

Pixel dimensions to print size at 300 DPI and every quality level.

RGB To CMYK

Convert hex or RGB colours to CMYK percentages and back.

Scientific Notation Converter

Convert numbers to scientific, E and engineering notation and back.

Square Km To Square Miles

Convert square kilometres to square miles with the exact factor.

Square Metres To Square Feet

Convert square metres to square feet with the exact factor.

TB To PB

Convert terabytes to petabytes: divide by 1,000, or 1,024 for binary.

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Tablespoons To Grams

Tablespoons and teaspoons to grams, any ingredient, any spoon standard.

Tablespoons To Ml

Convert US tablespoons to millilitres: multiply by 14.79.

Teaspoons To Ml

Convert US teaspoons to millilitres: multiply by 4.93.

Tonnes To Pounds

Convert metric tonnes to pounds with the exact factor.

Images 23

HEIC, WebP, AVIF, PNG, JPG, BMP, TIFF, SVG and 3D model formats.

AVIF Converter

Convert AVIF to PNG, JPEG or WebP, or encode to AVIF.

GIF To PNG

Convert a GIF to PNG or JPG, or every frame to a ZIP.

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GLB To OBJ

Convert a GLB or glTF model to OBJ for older 3D software.

HEIC To JPG

Turn an iPhone HEIC photo into a JPEG.

HEIC To PNG

Decode an iPhone HEIC into a lossless PNG.

HEIC To WebP

Turn an iPhone HEIC photo into a small WebP for the web.

ICO To PNG

Convert an ICO icon to PNG, one size or every size.

Image Converter

Convert HEIC, TIFF, PSD, WebP and more to PNG, JPG, WebP or AVIF.

Image To Data URI

Base64-encode an image as a data URI for CSS or HTML.

Image To WebP

Convert to WebP, JPEG or PNG with a quality slider.

OBJ To GLB

Convert OBJ, MTL and textures into one GLB file in the browser.

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OBJ To STL

Convert an OBJ model to STL for your slicer, scaled to millimetres.

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PLY To STL

Convert a PLY scan or mesh to STL for 3D printing.

PNG To JPG

Shrink a PNG into a JPEG with a quality slider.

PSD To PNG

Convert a Photoshop PSD to PNG, with every layer if you want.

STL To GLB

Convert STL to GLB in the browser with colour and up-axis fixed.

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STL To OBJ

Convert an STL print file to OBJ with the up axis fixed.

SVG To JPG

Rasterise an SVG to a JPEG at any width.

SVG To PNG

Rasterise an SVG to a PNG at any width.

SVG To WebP

Rasterise an SVG to a small WebP at any width.

TIFF And BMP Converter

Turn TIFF scans and old BMP files into JPG or PNG.

WebP To JPG

Turn a WebP into a JPEG that everything can open.

WebP To PNG

Turn a WebP into a PNG, transparency kept.

Audio & Video 36

WAV to MP3, video to GIF, sample rate, bit depth and frame rate.

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AAC To MP3

Convert raw .aac audio into an MP3 for any player.

Audio To Base64

Turn a short audio clip into a base64 data URI.

Audio To CSV/JSON

Export raw audio samples as CSV or JSON for analysis.

Audio To OGG/WebM

Encode audio to WebM or OGG Opus, or MP4 AAC, locally.

Audio To WAV

Convert MP3, M4A, FLAC or OGG to 16- or 24-bit WAV.

Audio To Video

Put a still image behind an audio file to make an uploadable video.

Bit Depth Converter

Convert 24-bit to 16-bit WAV with proper dither.

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FLAC To MP3

Shrink lossless FLAC music into a portable MP3.

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FLAC To WAV

Unpack lossless FLAC into a 16- or 24-bit WAV.

FPS Converter

Convert a video to a different frame rate, keeping its speed.

GIF To Video

Convert an animated GIF into a much smaller video file.

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HEVC To H.264

Convert iPhone HEVC (H.265) video to H.264 that plays anywhere.

Image Sequence To Video

Join numbered still frames into a video at any frame rate.

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M4A To MP3

Convert iPhone and iTunes M4A audio to MP3 in your browser.

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M4A To WAV

Turn iPhone voice memos and M4A files into editable WAV.

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MKV To MP4

Turn an MKV into an MP4 that phones, TVs and editors open.

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MOV To MP4

Turn an iPhone or QuickTime MOV into an MP4 that plays anywhere.

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MP3 To WAV

Turn an MP3 into an editable 16- or 24-bit WAV.

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MP4 To MP3

Pull the sound out of a video and save it as an MP3.

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MP4 To WebM

Convert an MP4 to a royalty-free VP9 WebM for the web.

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OGG To MP3

Convert OGG Vorbis audio into an MP3 that plays anywhere.

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OPUS To MP3

Turn WhatsApp and Telegram .opus voice notes into MP3.

Sample Rate Converter

Resample audio to 44.1, 48, 16 kHz or any common rate.

Screenshot To Video

Scroll a tall page screenshot smoothly from top to bottom as a video.

Stereo To Mono

Downmix stereo audio to mono and export it as WAV.

Text To Speech Downloader

Read text aloud in any browser voice and save it as audio.

Text To Video Card

Turn a line of text into a title card video with a simple animation.

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Video Converter

Convert MP4, MOV, MKV or WebM video to MP4 or WebM.

Video To Data URI

Turn a short clip into a base64 data URI or an inline video tag.

Video To GIF

Convert a short section of a video into an animated GIF.

Video To Image Sequence

Save a video's frames as numbered PNG or JPG files in a zip.

Video To WebP

Turn a video clip into a small, looping animated WebP.

WAV To MP3

Encode WAV or other audio to MP3, without uploading it.

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WebM To MP3

Pull the audio out of a WebM file as an MP3.

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WebM To MP4

Convert a WebM clip to an MP4 that plays on any device.

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MP4 Compressor

Shrink a video to an MP4 under a target size in MB.

Documents 8

HTML, text and images to PDF, HTML to Markdown and lists to CSV.

HTML To Markdown

Turn HTML into clean Markdown with lists, links, code and tables.

HTML To PDF

Turn pasted HTML into a clean PDF with headings, lists and links.

JPG To PDF

Put JPG photos into a PDF, one per page.

Line Ending Converter

Convert text between LF, CRLF and CR line endings instantly.

List To CSV Converter

Turn a line-per-item list into a comma-separated row.

PNG To PDF

Put PNG images into a PDF, one per page.

Text To HTML Converter

Wrap plain text in semantic HTML paragraph tags.

Text To PDF

Turn pasted plain text into a tidy, word-wrapped PDF.

Data & Code 22

Number bases, timestamps, colours, CSS units, keys, coordinates and text forms.

BPM To Milliseconds Calculator

Tempo to delay times in ms and Hz for every note value, and back.

Base Converter

Convert numbers between binary, octal, decimal and hex.

CSS Colour Converter

Convert CSS colours between hex, rgb, hsl, hwb, lab, lch and oklch.

CSS Nesting Converter

Nest flat CSS with & or flatten nested CSS back into plain rules.

CURL Converter

Turn a curl command into code in 24 languages.

Case Converter

Seven case conversions, from shouted headline to variable name.

Coordinate Converter

Convert lat/lng between decimal, DMS and UTM on a map.

Date To Words Converter

Write any date out in words for invitations, cheques and documents.

Epoch Converter

Convert Unix timestamps to dates and back again.

GPX Converter

Convert GPX, KML and GeoJSON to each other or to CSV.

Hours To Minutes Converter

Convert between seconds, minutes, hours, days and weeks.

IP Range To CIDR Converter

Turn start and end IP addresses into the fewest CIDR blocks.

Jeans Size Converter

Turn waist and inseam measurements into W/L jeans sizes and conversions.

Modern CSS Units Converter

Convert ch, cap, lh, dvh, cqi and other modern CSS units to px.

Number To Words Converter

Numbers to English words and written numbers back to digits.

PEM To JWK Converter

Convert public and private keys between PEM and JWK.

Punycode Converter

Convert domains between Unicode and xn-- Punycode in both directions.

SSH Key Converter

Convert SSH public keys between OpenSSH, SSH2 and PEM formats.

Tailwind Colour Converter

Convert hex codes to the nearest Tailwind class, or Tailwind classes to hex.

Tailwind To CSS

Turn Tailwind utility classes into plain CSS declarations.

Unicode Converter

Convert text to and from code points, escapes, entities and UTF-8 bytes.

Viewport Unit Converter

Convert px to vw, vh, vmin, vmax and rem for any viewport size.

How the converters are organised

Units covers length, weight, temperature, volume, area, speed, energy and data sizes, one pair per page with the factor and a reference table. Images converts between JPG, PNG, WebP, AVIF, HEIC, BMP, TIFF and SVG, plus 3D model formats. Audio & Video re-encodes sound and moving pictures, turns clips into GIFs and back, and changes sample rate, bit depth and frame rate. Documents produces PDFs from HTML, text and images and moves text between HTML, Markdown and CSV. Data & Code handles number bases, timestamps, colour notations, CSS units, keys and the other formats developers swap between all day.

Why conversion happens in the browser

A converter that uploads your file needs a server to receive it, store it for a while and send it back. These pages decode the file with the browser's own image, audio and video APIs, re-encode it in memory and hand you the download. That is faster for small files, works offline once the page has loaded, and means a private photo or document never leaves the machine it is already on.

Lossless and lossy

Some conversions change only the container and keep every pixel or sample, such as PNG to WebP lossless or WAV to FLAC. Others re-encode to a smaller lossy format, such as JPG or MP3, where you choose the quality. Each page says which kind it performs, so you know before you download whether anything was thrown away.

Where these tools also appear

Converters are listed here and on the hub they came from, so the HEIC converter still shows under image tools and the kg to lbs page still shows under calculators. The address of each tool has not changed.

FAQ

Are my files uploaded when I convert them?

No. Files are read with the browser's File API and converted inside the page using canvas, Web Audio and WebCodecs. The site has no upload endpoint, so there is nowhere for a file to go and nothing kept afterwards.

Is there a file size limit?

Only your device's memory. A phone handles photos and short clips comfortably; a long video or a very large image is better converted on a desktop, and the pages that are affected say so.

Are the unit conversion factors exact?

Yes. Each unit page uses the defined factor, such as exactly 2.54 centimetres to the inch or 0.45359237 kilograms to the pound, and shows it so you can check the arithmetic yourself.

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