Filewhisk

File tools that run in your browser

Every tool on this site processes your files locally on your own device. Nothing is uploaded, nothing is stored, and there is no file size cap or account to create.

Runs in your browser Files never leave your device No sign-up 166 tools

Image Compression Tools Guide & all tools

Compress Image to Target Size Hit an exact KB target for uploads and forms. Compress Image to 20KB Under 20KB, or between 10 and 20 when the form wants both. Compress Image to 50KB Under 50KB, or between 20 and 50 when the form sets a floor. Compress Image to 100KB The exact ceiling most upload forms enforce. Compress Image to 200KB Comfortable quality at a size email and forums accept. Compress Image to 500KB Near-original quality, still small enough to matter. Compress Image to 1MB Under 1MB by either definition, at the highest quality that fits. Compress Image for WhatsApp Control the compression before WhatsApp does it for you. Compress Image for Discord Fast uploads, clean inline previews, your choice of quality. Compress PNG Still a PNG, still transparent, and you can see how much changed. Compress GIF Compare three levels side by side, or fit an exact size limit. Increase Image Size in KB Reach a form's minimum file size without touching the picture. MB to KB Converter Both kilobytes side by side, and a photo compressor for when the file itself has to shrink.

Image Converters Guide & all tools

Convert Image Format PNG, JPG, WebP and AVIF, in both directions. JPG PNG to JPG Transparent areas filled with the colour you pick. JPG to PNG Converter Exact PNG copies of your JPGs, with the print size and colours intact. JPG HEIC to JPG iPhone photos, opened and converted right in your browser. PNG HEIC to PNG Lossless PNG from iPhone and HEIF images, transparency included. JPG WebP to JPG For the apps and printers that still won't take WebP. PNG WebP to PNG Keeps transparency, works everywhere PNG does. WebP to GIF Animated WebP to GIF at the same speed, with transparency handled and nothing uploaded. AVIF to JPG Converter For the apps, forms and printers that won't take AVIF. AVIF to PNG Converter Lossless copies of AVIF images, see-through parts included. JFIF to JPG Converter A .jfif is already a JPEG. This gets you the .jpg without losing anything. GIF Maker from Images Put your pictures in order and get a GIF that looks and plays the way you set it. GIF PNG to GIF Converter Transparent PNGs without the white fringe, logos without colour changes. WebP JPG to WebP Same photo, a smaller file — usually 25-35% less. WebP PNG to WebP Same transparency, a noticeably smaller file. AVIF JPG to AVIF Smaller files than JPEG, at the same visual quality. AVIF PNG to AVIF Transparency kept, file size dramatically smaller. AVIF WebP to AVIF Squeeze more out of images that are already WebP. JPG TIFF to JPG Every page of a multi-page TIFF, not just the first. PNG TIFF to PNG Pixel-for-pixel, transparency intact, every page. TIFF JPG to TIFF Set the DPI, keep the colour profile, check every pixel. TIFF PNG to TIFF Transparency, 16-bit colour and DPI carried across exactly. JPG PSD to JPG Print files keep their colours, and no PSD comes out blank. PNG PSD to PNG The whole picture with its transparency, or every layer as a separate PNG. JPG GIF to JPG Grabs the first frame as a static JPG. PNG GIF to PNG Keeps transparency, keeps every pixel - and tells you when to use JPG instead. PNG SVG to PNG Vector in, exact pixel dimensions out, transparency kept. PNG to SVG Real vector shapes you can scale, cut and edit, not a picture inside an SVG. Image to Base64 Data URI, raw Base64, CSS or HTML — ready to paste.

PDF Tools Guide & all tools

Compress PDF Smaller PDFs with text that stays sharp and selectable. Compress PDF to 200KB Hits the size limit with the best quality that fits. Merge PDF Set the order, pick pages, add bookmarks. Split PDF By page, range or bookmark - or cut spreads in half. Rotate PDF Turn one page or all of them - and the rotation stays. Delete PDF Pages Click to remove pages - bookmarks and links still work. PDF JPG to PDF One PDF or one per image, at original quality. HEIC to PDF iPhone photos into one PDF, at a size you choose. JPG PDF to JPG Every page as a sharp JPG or PNG, up to 300 DPI. PDF to PNG Lossless pages, on white or transparent, as small as PNG gets. Extract Images from PDF Every embedded photo, scan and graphic - exactly as stored. Fill PDF Form Type into the form's own fields, then save it editable or flattened. Sign PDF Draw, type or photograph your signature, then place it anywhere. Protect PDF AES-256 encryption, done on your device, checked before you download. Unlock PDF See what kind of lock a PDF has, then remove it without uploading. Redact PDF Black out text so it is gone, not just covered, and check the saved file. Add Page Numbers to PDF Pick the position and format, then see exactly where every number lands. Add Watermark to PDF Text or logo, tiled or single — and behind the content, not over it. Reorder PDF Pages Drag, type an order, or put a double-sided scan back in sequence. Extract Text from PDF Clean paragraphs, not broken lines and page numbers. PDF to Grayscale Black and white pages, with text that is still text. Make PDF Look Scanned Scanner-style pages, with text you can still search. Resize PDF Pages New paper size, same document: sharp text, working links, nothing cut off by surprise. Crop PDF Drag to crop, or trim the white margins of every page at once. And know what is still hiding outside the crop. PDF Booklet Maker Print, fold, staple: pages come out in reading order, whatever your printer can do. Add Text to PDF Click a blank on a form and type: the text sits on the line, at the form's own size.

Resize and Crop Tools Guide & all tools

Resize Image Exact pixels or a percentage, with aspect ratio locked. Change Image DPI Set the DPI or the print size. The pixels stay exactly as they are. Crop Image Drag the frame, or type exact pixel values. Circle Crop Image Round avatars with a real transparent background. Rotate Image Quarter turns, free angles and mirror flips. Add Border to Image Any colour, any width, corners rounded if you want. Split Image Into Grid 3x3 profile grids, carousel strips, any rows and columns. Combine Images Row, column or grid - your spacing, your background.

Image Editing Tools Guide & all tools

Make Background Transparent Remove a white or plain background from logos, signatures and icons, with clean edges and no upload. Add Text to Image Put text on a photo, check that it can actually be read, and keep the full-size original. Black and White Image Real grayscale, or truly two colours. Your choice. Add Watermark to Image Text or logo, one corner or tiled across. Pixelate Image Drag a box over what needs hiding - one area or several. Meme Maker Classic top and bottom text, no watermark, ever. Color Picker From Image Click a pixel for its HEX and RGB, or extract a whole palette. Remove EXIF Data Shows the GPS and camera data before stripping it. View Image Metadata Camera, settings and GPS location, read in your browser. ASCII Art Generator From a picture or a word, sized for where you will paste it.

Social Media Image Sizes Guide & all tools

Social Media Image Resizer Pick the sizes you need, export them together. Instagram Post Size Square or portrait, cropped around what matters. YouTube Thumbnail Size 1280x720, cropped around your subject, not the middle. Twitter Header Size 1500x500, with the avatar overlap marked for you. Facebook Cover Photo Size 820x312, with the mobile-crop safe zone marked. Resize Image for LinkedIn LinkedIn's exact 400x400px spec, positioned by you. Discord Banner Size Server and profile banner from one image, both crops shown. Twitch Emote Resizer All three sizes, a transparent background, and a preview in chat at real size.

App Icon and Store Asset Tools Guide & all tools

App Icon Generator iOS sets and Android adaptive icons, ready to drop in. Android App Icon Generator Adaptive icons, a themed-icon layer that keeps your logo's detail, and the Play Store icon. App Store Screenshot Generator Headlines, device frames and every required size, without an account or export limit. Favicon Generator Every size, plus manifest and the HTML to paste.

Passport Photo Tools Guide & all tools

Passport Photo Maker Country presets with head-height guides and a print sheet. US Passport Photo Maker 2x2 inches, with a head-height guide, plus a 4x6 print sheet. UK Passport Photo Maker 35x45mm, with a head-height guide, plus a print sheet. Schengen Visa Photo Maker 35x45mm, standardised across all Schengen states. Indian Passport Photo Maker 35x45mm, updated to the 2025 ICAO standard.

Video Tools Guide & all tools

Compress Video Measured after encoding, not estimated before. Trim Video Lossless or frame-exact, and it tells you which. Rotate Video Turned without re-encoding, and checked frame by frame. Crop Video Drag a box, get exactly those pixels. Resize Video Fewer pixels, and a file that actually gets smaller. Add Subtitles to Video Burned into the picture, so they show on every phone and app. SRT to VTT Converter Converted, fixed, and loaded once to prove it works. Change Video Speed The picture is copied, not re-encoded. Voices stay natural. Reverse Video Backwards or boomerang, every frame kept, no size limit. Merge Videos Matching clips are joined without re-encoding. The page tells you which case you have. Add Music to Video The picture is copied as it is. Only the sound is new. MP4 MP3 to MP4 Your sound, untouched, with cover art on screen. A 3-minute song takes about 3 seconds. Mute Video Every frame checked against the original. MP4 MOV to MP4 Converter Same frames, new container, in seconds. MKV to MP4 Converter Same picture, new container. Subtitles and sound tracks are not lost on the way. MP4 WebM to MP4 Converter A screen recording that plays, shows its length and skips ahead anywhere. MP4 GIF to MP4 Converter The animation as a video, at the speed the GIF plays. Screen Recorder Screen, window or tab, with sound and microphone, saved as an MP4 that works everywhere. Video to Frames Decoded frame by frame, so the count is exact. Extract Audio from Video Copied out of the file, not converted. Trim Audio Lossless MP3, M4A, FLAC and OGG cuts, with the real cut points shown. Split Audio Cut at the pauses, into equal parts or every N minutes, without re-encoding. Remove Silence from Audio Shorten the pauses, not the words. Voice Recorder Record from your microphone and save MP3 or WAV, with no time limit and no upload. Increase Audio Volume Louder without distortion, measured before and after. Change Audio Speed Faster or slower, with the pitch kept or changed, measured to the sample. Reverse Audio Play any recording backwards, or record yourself and hear it reversed. MP3 M4A to MP3 Keeps the title, artist and cover art, at a bitrate that fits. MP3 WAV to MP3 Checks each recording first, so the MP3 doesn't clip or waste space. MP3 MP4 to MP3 Takes the sound from a video and saves it as an MP3, at a bitrate that fits. MP3 FLAC to MP3 320 kbps with tags and cover art, checked so loud tracks don't clip. MP3 OGG to MP3 Vorbis music or Opus voice notes, each converted the way it should be. MP3 WebM to MP3 The sound from a WebM, with a length players can seek. WAV MP3 to WAV 16-bit or 24-bit WAV, exactly as long as the original recording. WAV M4A to WAV Lossless voice memos come out sample for sample. AAC comes out the exact length. M4R MP3 to M4R (iPhone Ringtone) Pick the part you want and get an M4R that iOS 26 accepts straight from the Files app. Compress MP3 Smaller MP3s, without making any file worse than it needs to be. Merge MP3 Files Join MP3s without losing quality, and get a file that shows its real length. Video to GIF Set the size limit and let the tool find the settings.

Data Tools Guide & all tools

CSV to Excel Each column typed on purpose, not guessed by Excel. Excel to CSV What the cell holds, not what the screen rounds it to. Excel to JSON Typed values, ISO dates, and a header row that is actually the header. CSV to JSON Every row counted, every change reported. JSON to CSV Every key becomes a column, not just the first record's. CSV to XML Every renamed header listed, every collision kept apart. Split CSV Splits records, not lines — so quoted fields survive. Split Excel Each piece opens with its header, and its formulas still point at the right row. JSON XML to JSON The same shape every time, not one shape per file. XML JSON to XML Every renamed key listed, every collision named. CSV XML to CSV It shows you what a row could be, with the counts. Create ZIP File Built in your browser, then read back to prove it opens.

Text Tools Guide & all tools

Word Counter There is no single answer to “how many characters”. It depends where you are sending it. Case Converter Changing case is not always reversible, and not every language agrees on how to do it. Text Diff When two lines look identical and are not, this tells you exactly why. Unix Timestamp Converter Every unit, every time zone, and the daylight saving traps flagged. JSON Formatter and Validator Format and validate JSON without quietly changing it. Base64 Encoder and Decoder Encode text or files, decode anything, and find out why a string will not decode. Hash Generator Hash text or files of any size, and check them against a published checksum.

Business and document tools

Invoice Generator Invoice, quote or receipt - filled in and numbered for you. QR Code Generator Static codes, no account, no expiry date - and a scan check before you download. Barcode Generator Check digits calculated, bulk from a list, PNG, SVG and a print sheet. % Profit Margin Calculator Profit, margin, markup and break-even after every fee. Signature Generator Draw it, type it, or photograph the one you already sign.

Guides

All guides
How to burn subtitles into a video permanently We burned the same SRT into a video with FFmpeg on Windows eight ways. Three common commands failed outright, and one finished without an error but left a line out. The working methods, and what to check first. 5 min read How to change a photo to 300 DPI We opened eight real camera and phone photos in Windows and in Python: the same file often gave two different DPI numbers. How to set 300 DPI so every program agrees, and when 300 DPI is not enough. 5 min read How to redact a PDF for free Six common ways of blacking out text in a PDF, and a text extractor read the hidden text back in all six. What real redaction does, how to do it for free, and how to check. 5 min read

How these tools work

Every tool on this page is a web page that does the work itself. When you drop a file in, the browser reads it into memory, processes it with the same engines it uses to display images and PDFs — Canvas, WebCodecs, WebAssembly — and hands you the result. No copy of your file is sent anywhere, because there is nowhere for it to be sent.

You can check that claim in about ten seconds: open any tool, wait for the page to finish loading, then turn off your Wi-Fi and drop a file in. It still works. Nothing on this site needs a network connection once the page is open, and the browser's own developer tools will confirm that no request carries your file.

What that changes in practice

What it cannot do

Being honest about the edges: there is no OCR here, so text inside a scanned page stays a picture. Video work is limited to what a browser can encode in reasonable time. Very large files on an old phone will run out of memory, and the tool will say so rather than silently producing a broken result. And no image tool of any kind can recover detail that compression has already discarded — upscaling invents pixels, it does not restore them.

Where to start

If you are here because an upload form rejected your file, the target-size compressors are the fastest route. If you are preparing a document to send, the PDF tools merge, split, sign and shrink without changing the text inside. And if you would rather understand the problem before picking a tool, the guides explain what actually makes a file large, with measurements rather than rules of thumb.