Concatenate audio

We offer a variety of features to reduce audio size while maintaining quality, as well as add effects like loops or watermarks.

The /audio/concat Robot concatenates several audio files together.

What can I do with this?

Our /audio/concat Robot can be used in combination with other Robots, to create powerful workflows unique to your use case. For inspiration, here is an example scenario, with explanations and code for all platforms, that you can also try live on our website:

Transloadit allows you to concatenate multiple audio files together. This is useful when you want to...


This Robot supports parameters such as preset, bitrate, sample_rate, ffmpeg, ffmpeg_stack to influence its behavior. Read all about the technical details in its docs.

Blog posts

We wrote the following posts about the /audio/concat Robot on our blog:


Transloadit is a SaaS with a subscription model.

We offer a discount of 75%, effectively counting only every fourth byte of audio files that you concatenate with /audio/concat. Assuming an average input audio file of 3.8MB and an output of 3.04MB, here's what it would approximately cost to concatenate audio files per Plan:

Plan Price Costs per file within your Plan Overage Fee
Sandbox (2GB) Free $0.0
to concatenate 399 audio files
Startup (10GB) $49/month $0.025
to concatenate the first 1996 audio files
Small Business (30GB) $99/month $0.017
to concatenate the first 5988 audio files
Medium Business (150GB) $249/month $0.008
to concatenate the first 29941 audio files
Enterprise 📞 - N/A

Just like with your mobile plan, pricing goes down when you commit to larger monthly volumes. When you reach your plan's limit, we'll continue to service you, but remind you to upgrade to more cost-efficient plans. This is unless you explicitly set budgets. You can change plans at any time. More info and available plans on our Pricing page.

Don’t just take our word for it

  • “I'm not usually one for fanboy-ism but Transloadit is one service I would recommend without hesitation. Their product and customer support is outstanding.”
    Dave Perrett, CTO at Shuttlerock
  • “Having a solution for both uploading and transcoding has been a godsend for the current scale that we are at five years after first choosing Transloadit.”
    Jon Wong, Engineer at Coursera
  • “Using Transloadit saves development and maintenance. Being able to focus on our product instead of reinventing the wheel cannot be understated.”
    Matt Sumner, Developer at thoughtbot