Files Stay On Your Device No watermark Works offline
For companies

Compress audio file

Compress MP3 and other audio to a smaller file. Pick a quality, or a size that fits WhatsApp (16 MB) or an email, and the tool shows the bitrate and the new size before it starts. A free way to reduce MP3 file size without sending the file anywhere: nothing is uploaded.

How to compress an MP3 file

  1. 1Drop an audio file in, or click to choose one
  2. 2Under "How small", pick a quality or a target size
  3. 3Read the plan: bitrate, mono or stereo, the new size
  4. 4Click "Compress" and save the MP3
  5. A smaller MP3, saved to your device

What happens to your files

  • Nothing is uploaded.Your audio is read and compressed by your browser, on your own device
  • You see the size first.The plan names the bitrate, mono or stereo, and about how big the file will be
  • It fits a size limit.For a target in MB, the tool picks the highest standard MP3 bitrate that fits

What you can do

  • Pick a quality under "Pick a quality": 128 or 96 kbit/s for music, 64, 48 or 32 kbit/s for speech
  • Aim for a size instead: "WhatsApp (16 MB)", "Email, Gmail (25 MB)", "Email, Outlook (20 MB)" or "Custom size" with your own number of MB
  • Shrink recordings in other formats too. WAV, M4A, OGG, OPUS and FLAC files and the sound of MP4, MOV and MKV videos all come out as MP3
  • See what it saved: the result shows its size and how many percent smaller it is than before
  • Listen to the result in the player before you send it on. It starts only when you press play

Good to know

  • The result is always an MP3. Below 96 kbit/s it is saved in mono (one channel)
  • Sizes are counted in decimal MB (1 MB = 1,000,000 bytes)
  • A target that is too small for the length of the recording is refused, and the tool names the smallest size that works
  • If the file is already as small as the quality or the target you picked, the tool says so and does not start
  • Compressing takes detail out of the sound for good, so keep the original. The tool works best in desktop Chrome or Edge

Questions

How do I reduce MP3 file size?

Drop the MP3 in, choose a lower quality, such as 96 kbit/s for music or 64 kbit/s for speech, and click "Compress". The plan shows the new size before you start.

How do I make an audio file small enough for WhatsApp or email?

Choose "WhatsApp (16 MB)" or one of the email entries under "How small". The tool then picks the highest MP3 bitrate that keeps the file under that size.

Does a compressed MP3 sound worse?

Somewhat, and more so the further you go. The list marks 128 kbit/s as good for music and 64 kbit/s as good for speech. 32 kbit/s is the smallest setting and meant for speech only.

Is my file uploaded when I compress it online?

No. The file is read and compressed by your browser, on your own device. The tool makes no request with it.

Why is my file mono after compressing?

Below 96 kbit/s the MP3 is saved with one channel. At such low bitrates the bits go further in one channel than spread over two.

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For companies

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In offices, on building sites and in agencies, teams handle sensitive files all day. ToolRecipe gives everyone the same tools and the same recipes, and the files are processed on each person's own computer.

Plan an introduction call What companies get
  • Files are processed on the employee's device
  • Company recipes everyone runs the same way
  • One place instead of ten converter sites

How it works

Small tools that run in your browser.

What runs where

Your browser keeps the tools you use: the same kind of tools you would otherwise use on a website. Your files stay on your device and are not uploaded.

A tool your browser has kept also works without internet. Under Offline, at the bottom of this page, you can save everything at once, and the site keeps working without a connection.

Some tools have AI built in, for example to remove a background or enlarge a photo. Your browser downloads their AI models once, from ToolRecipe itself, and then runs them on your device. No tool sends your files to an online AI service or to us.

On a computer, these tools use the graphics chip when it passes a short check, because that is usually faster. On a phone they run on the processor, with settings that fit in a phone’s memory.

Using a tool

Give the tool your file, choose what you want, save the result.

  • Start on the home page

    Drop a file in the box on the home page, or try a sample photo. Pick what you want to do and press “Open tool”. The tool opens with your file in it.

  • Put a file in

    Drop it anywhere on the page, pick it with “Choose a file” or paste it. No file yet? Search for the job, like “heic to jpg”.

  • Choose the settings

    Each tool shows only the settings it needs. Often one click is enough.

  • Save the result

    Saved files go to your downloads. A copy also waits in Results.

  • Results

    The Results tab on the right edge keeps your latest results in this browser until you remove them. “Clear all” empties it.

Chaining tools

What one tool makes can go straight into the next, without saving it and opening it again.

  • “Use it in”

    Tap a result in Results and pick a tool under “Use it in”. The result is handed on to that tool.

  • Drag it

    You can also drag a result onto an open tool. On a phone, touch and hold it first.

  • From a chain to a recipe

    To run the same tools again later, make a recipe of them in the recipe builder.

The recipe builder

Drop a file in the box on the home page and add the steps one at a time. Nothing runs until you press “Run recipe” or “Open tool”.

  • Pick what to do

    The box shows a tile for each kind of job your file allows, such as “Make it smaller”. A tile opens its ready-made choices and every tool of that kind. “Back” returns to the tiles.

  • Add steps

    Each choice becomes a numbered step in the row at the top. “Add another step” shows suggested next steps, then the tiles for what the last step makes. The cross on a step removes it, and “Undo” brings it back.

  • Name it

    The recipe is called “My recipe” until you name it. Press the pen next to the name to change it.

  • Run it

    With one step, press “Open tool” and the tool opens with your file. With two or more steps, press “Run recipe”. The recipe opens on its own screen, and the steps run one after the other.

  • Steps that need you

    Most steps run by themselves. A step marked “Your turn” waits for you, for example when you need to sign a PDF. When you are done, press “Continue to next step”, or “See the result” on the last step.

  • Save or start over

    “Save the current steps as a recipe” keeps the steps under My recipes. You do not have to run them first. On the recipe screen, “Save this recipe” under the steps does the same. “Start over” clears the box for another file.

Recipes

A recipe is a few tools in a row: what one step makes goes into the next.

  • Ready-made recipes

    “All recipes” in the menu lists recipes for common jobs. Drop your file on one and it runs step by step.

  • Make your own

    Build one in the box on the home page. On My recipes, “New recipe” opens the same builder at the top of the page, with a search box for the tool you need next.

  • My recipes

    Your saved recipes are under “My recipes” in the menu, in this browser. Open one to rename it or change its steps. Changes are saved at once. “Start with a file” runs it on a new file. “Delete” asks you to confirm, then deletes it.

  • Share a recipe

    “Copy share link” makes a link to the steps, never to your files. Nothing starts for the person who opens it until they choose a file of their own.

Ways of working

Tools and recipes run in your browser, on your device.

  • Start from a file

    Drop it in the box on the home page and pick what you want to do. Choose one step to open its tool, or add more to make a recipe.

  • Start from a tool

    Search for the job or open a tool from the menu. When the result is ready, tap it in Results and pick the next tool under “Use it in”.

  • Keep the steps

    A saved recipe keeps its name, its tools in order and the setting of each step. It never keeps your files or their names.

  • Come back later

    Open My recipes in the same browser, on the same device, and run a recipe on a new file. A recipe stays there until you delete it or clear your browser data.

Finding tools again

Every tool and every recipe has its own address.

  • Bookmark it

    On a tool’s page, press Ctrl+D (⌘D on a Mac) to keep it in your browser’s bookmarks.

  • On your home screen

    A tool can sit on your phone’s home screen like an app. See Install, below, for how.

  • Your own recipes

    Recipes you saved are under “My recipes” in the menu.

  • The stars

    The stars under a new result ask how well the tool worked. Your answer helps us improve it. Stars do not save the tool for you.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari
  2. Tap Share (the square with the arrow)
  3. Choose “Add to Home Screen”, then Add

Android

  1. Open the tool in Chrome
  2. Tap the menu (⋮) at the top right
  3. Choose “Add to Home screen” or “Install app”

Computer

  1. Open the tool in Chrome or Edge
  2. Click the install icon in the address bar
  3. Choose Install

Regarding updates

We try to do regular updates and post new tools.

How you can check that files stay here

Tools read your files and make the result in this browser, on your device. Your files are not uploaded to be processed.

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If you send us your email address to ask about ToolRecipe for companies, we store it with that request at our analytics service in the EU and receive it by mail, to answer you. Write to info@toolrecipe.com to have it deleted.

Results stay in this browser until you clear them.

Works offline

This site is saved on this device, so it opens without a connection. Big tools are saved the first time you use them.

Skills

Claude skills we use ourselves, one job each.