ASCIIFlow
asciiflow.com
Draws boxes and arrows as plain ASCII you can paste into a comment
No sign-upOn device
Nothing leaves your device
Tools that process files in the browser, with no upload at all.
The strongest privacy guarantee a web tool can offer is that the file never travels. These run entirely in the page — you can load them, disconnect from the network, and they still work.
34 sites in this collection
AudioMass
audiomass.co
A waveform audio editor that runs in the tab with nothing uploaded
No sign-upOn deviceBitwarden Password Generator
bitwarden.com
Generates a random password or passphrase without leaving the page
No sign-upOn deviceBulk Resize Photos
bulkresizephotos.com
Resizes hundreds of photos at once without uploading any of them
No sign-upOn deviceCalmly Writer Online
calmlywriter.com
A blank page with a focus mode that dims everything but this sentence
No sign-upOn deviceConvert Town
convert.town
A pile of one-click converters that never upload the file
No sign-upOn deviceCyberChef
gchq.github.io
Chains encoding, hashing and decryption steps into a repeatable recipe
No sign-upOn deviceDevDocs
devdocs.io
One fast search box across a hundred API references, usable offline
No sign-upOn devicediagrams.net
diagrams.net
Full diagram editor that works without an account or a saved file
No sign-upOn deviceClassicDuckDB Web Shell
shell.duckdb.org
Run SQL over your own CSV or Parquet file without uploading it
No sign-upOn deviceExcalidraw
excalidraw.com
Hand-drawn-looking whiteboard that opens instantly with no sign-up
No sign-upOn deviceezyZip
ezyzip.com
Opens and builds ZIP, RAR and 7z archives without uploading them
No sign-upOn deviceHoppscotch
hoppscotch.io
Sends HTTP, GraphQL and WebSocket requests from a browser tab
Free tierOn deviceJSON Crack
jsoncrack.com
Turns a wall of JSON into a node graph you can pan and search
Free tierOn devicejwt.io
jwt.io
Decodes a JSON Web Token into readable header, claims and signature
No sign-upOn deviceMarkmap
markmap.js.org
Turns a Markdown outline into a collapsible mind map as you type
No sign-upOn deviceMermaid Live Editor
mermaid.live
Write a diagram as text and watch it render beside you
No sign-upOn deviceoTranscribe
otranscribe.com
Play the audio and type the transcript in the same window
No sign-upOn devicePairDrop
pairdrop.net
Finds other browsers on your network and sends files straight to them
No sign-upOn devicePhotopea
photopea.com
Opens a PSD, keeps the layers, and runs entirely in a browser tab
No sign-upOn deviceRAWGraphs
rawgraphs.io
Makes the chart types nothing else offers — alluvial, beeswarm, treemap
No sign-upOn deviceRecordScreen.io
recordscreen.io
Records your screen and webcam from a tab, saving straight to disk
No sign-upOn deviceScreely
screely.app
Wraps a raw screenshot in a browser frame and a decent background
No sign-upOn deviceSQLFormat
sqlformat.org
Reformats an unreadable SQL statement into something reviewable
No sign-upOn deviceSquoosh
squoosh.app
Compare image compression settings side by side before you export
No sign-upOn deviceStackEdit
stackedit.io
A Markdown editor with live preview that keeps working offline
No sign-upOn deviceSVGcode
svgco.de
Traces a PNG or JPEG into a scalable SVG inside the browser
No sign-upOn deviceTableConvert
tableconvert.com
Converts a table between CSV, JSON, Markdown, SQL and Excel
No sign-upOn devicetldraw
tldraw.com
Infinite canvas that feels like a native app in a browser tab
No sign-upOn deviceToffeeShare
toffeeshare.com
Streams a file from your browser to theirs with no copy in between
No sign-upOn deviceUse A Passphrase
useapassphrase.com
Generates a word-based passphrase and shows how long it would take to crack
No sign-upOn deviceVERT
vert.sh
Open-source converter that handles images, audio and documents on your device
No sign-upOn deviceWebLLM Chat
chat.webllm.ai
Runs an open language model inside your browser, nothing sent to a server
No sign-upOn deviceWhisper Web
huggingface.co
Runs OpenAI's Whisper speech recognition inside your own browser
No sign-upOn device