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For companies

Audio joiner

An audio joiner that puts several recordings end to end: merge MP3 files into one, in the order you set. Files of the same kind are joined without re-encoding, so the quality stays as it is. Nothing is uploaded: the joining happens in your browser.

How to merge MP3 files into one

  1. 1Drop two or more audio files in, or click to choose them
  2. 2Put the files in order with the arrows
  3. 3Pick a format under "Save as", or leave it as it is
  4. 4Click "Join" and save the result
  5. One audio file, your parts in your order

What happens to your files

  • Nothing is uploaded.Your files are read and joined by your browser, on your own device
  • Same kind, no re-encoding.MP3 with MP3, AAC with AAC and WAV with WAV are copied into one file as they are
  • You know before you start.The tool says how long the result will be and whether the sound is copied or encoded again

What you can do

  • Join two or more files into one: the chapters of an audiobook, the parts of an interview, several songs as one long track
  • Change the order with the up and down arrows and take a file out of the list with ×. Every file shows its length
  • Mix formats. An MP3, a voice memo in M4A and a WAV can go into one file, which is then encoded again
  • Save the result as MP3, M4A (AAC), WAV (uncompressed) or OGG (Opus), or keep "Same as the first file"
  • Add MP3, WAV, M4A, AAC, OGG, OPUS, FLAC and WebM files, and the sound of MP4, MOV and MKV videos

Good to know

  • Files are copied without re-encoding only when they are all MP3, all AAC or all WAV and match in sample rate and channels (mono or stereo). Anything else, OGG and FLAC included, is encoded again into one file
  • Choosing a format under "Save as" always encodes again. With "Same as the first file", a FLAC in first place gives a WAV, which is also lossless
  • The files follow each other directly: no pause is added and there is no crossfade
  • The result is named after the first file, with "-joined" at the end. Title and artist tags are not carried over. You can add them with the ID3 tag editor
  • Long WAV files are large, about 10 MB per minute in stereo. The tool works best in desktop Chrome or Edge

Questions

How do I merge MP3 files into one?

Drop the MP3 files in, put them in order with the arrows and click "Join". If they have the same sample rate and channels, they are copied into one MP3 without re-encoding.

Can I merge MP3 files online without uploading them?

Yes. The files are read and joined by your browser, on your own device. Nothing is uploaded, and the tool makes no request with them.

Does joining lower the quality?

Not when the files are of the same kind: their sound is copied as it is. Files that differ are encoded again into one file, and the tool tells you so before you start.

Can I join files in different formats?

Yes. The result takes the format of the first file, unless you choose another one under "Save as". Put the files in the order you want first, because that also decides which one is first.

Is there a gap or a crossfade between the files?

Neither. One file starts where the one before it ends. For a soft start or ending, run a file through Fade in/out before you join.

Related tools

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How it works

From “ugh, this file” to done, in three steps.

  1. Drop it, or pick a task

    No file? Search for what you need. Files are processed on your device, not uploaded for processing.

  2. Pick what you want

    Smaller, another format, signed, merged. One click, no settings to study first.

  3. Make it a recipe

    Need three steps in a row every week? Chain them once and run the same recipe next time.

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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.

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  • Files are processed on the employee's device
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  • 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.

A security policy lets this page contact one address only: our own server, for counts. It passes page views and a fixed list of actions on to an analytics service in the EU, which counts them for us. Neither gets your files or their names. Anything else is blocked, and the badge at the top turns red and counts it.

If a tool fails, the page counts that too: only the kind of error and where in our code it happened, never the error's text, your files or what you typed.

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.