You will get your audiobook professionally mastered for ACX requirements
Top Rated
Project details
Ready to Launch Your Audiobook? Let’s Make it a Hit!
You’ve worked hard recording, editing, and proofreading your audiobook—now it’s time to ensure it’s mastered to perfection. Before hitting the market, your audiobook must meet ACX/Audible requirements, and that’s where I come in!
As an industry expert, I’ll ensure your audiobook is not just good but exceptional. From ACX compliance to enhancing overall audio quality, I’ll make sure it captivates listeners and stands out in a competitive market.
Let’s collaborate to make your audiobook sound amazing and leave a lasting impact. Get in touch today, and let’s get started!
You’ve worked hard recording, editing, and proofreading your audiobook—now it’s time to ensure it’s mastered to perfection. Before hitting the market, your audiobook must meet ACX/Audible requirements, and that’s where I come in!
As an industry expert, I’ll ensure your audiobook is not just good but exceptional. From ACX compliance to enhancing overall audio quality, I’ll make sure it captivates listeners and stands out in a competitive market.
Let’s collaborate to make your audiobook sound amazing and leave a lasting impact. Get in touch today, and let’s get started!
Language
English (North American)Tone
Professional/Formal, Natural, PowerfulWhat's included
| Service Tiers |
Starter
$150
|
Standard
$250
|
Advanced
$450
|
|---|---|---|---|
| Delivery Time | 3 days | 3 days | 3 days |
Number of Revisions | Unlimited | Unlimited | Unlimited |
Running Time (Seconds) | 7200 | 21600 | 36000 |
Voice-Over Recording | - | - | - |
Audiobook Proofing | - | - | - |
Audio Editing | - | - | - |
Split Chapters | - | - | - |
Noise Reduction | |||
Music Placement | |||
Mixing | |||
Retail Audio Sample |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$50 - $100Frequently asked questions
45 reviews
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HR
Henriette R.
Jun 11, 2026
Need a skilled audio fixer to remove microphone noise from MP4 recording
João did an excellent job removing high-frequency noise from a large batch of video recordings while maintaining clear, natural audio quality.
He was professional, easy to communicate with, and consistently delivered high-quality work. I was very happy with the results and would gladly work with him again.
Highly recommended.
He was professional, easy to communicate with, and consistently delivered high-quality work. I was very happy with the results and would gladly work with him again.
Highly recommended.
CG
Christine G.
Jun 4, 2026
Clean up audio
Joao was a life saver in cleaning up and enhancing poorly recorded audio and have them sound the best they possibly can. I tried numerous freelancers before him, and only he was able to magically fix them! Besides that, he is a pleasure to work with, and a clear communicator. Thanks Joao!!
MN
Mike N.
May 28, 2026
Podcast Editing
The project was completed under an hourly Upwork contract, however time was not consistently tracked and submitted through the Upwork Work Diary during the active production timeline as required by the contract structure. After project completion, additional payment was requested retroactively for hours that had not been properly logged during the course of the work. Deliverables also required multiple rounds of revisions and corrections throughout the process. For future projects, we recommend maintaining clear scope communication, accurate weekly time tracking, and adherence to Upwork billing procedures to avoid misunderstandings.
NS
Natalie S.
Apr 20, 2026
Audio Editors for AI-Training Conversation Data
YK
Yasmine K.
Apr 13, 2026
Podcast Editing
About João
Audio Engineer | Podcast Production Expert | Audiobook Specialist
98%
Job Success
Lisboa, Portugal - 10:56 pm local time
🎙 Podcast Editing & Production
Professional audio cleanup, mixing, and mastering
SEO-optimized show notes and transcription
Social media audiograms and clips for reels and TikToks
📚 Audiobooks (ACX Compliance)
Editing and mastering to meet ACX/Audible standards
Noise reduction, tonal adjustments, and format compliance
🎧 Audio Restoration
Removing hiss, hum, and background noise
Revitalizing vintage recordings, interviews, and old tapes
I use Adobe Audition, Pro Tools, and other advanced tools to ensure your content is polished and ready for distribution.
✅ If you want to know more about my video editing services, including multi-cam editing, color grading, and motion graphics, please visit my video editing profile.
Why Work With Me?
Proven Expertise: Over 15 years of audio engineering experience, with a track record of satisfied clients.
Top 2% Upwork Freelancer: Consistently delivering professional results.
Reliable and Efficient: You can trust me to deliver quality work on time.
Client Testimonials:
★ ★ ★ ★ ★ “João ensured my audiobook passed ACX requirements on the first submission. His attention to detail was exceptional.”
★ ★ ★ ★ ★ “His podcast editing services are top-notch. The audio was flawless, and the social media clips he created helped grow my audience.”
★ ★ ★ ★ ★ ”Our Sound Engineer and partner in the audiobook Mr. Joao Zurzica has processed the resulting files and formatted them for audiobook upload. Joao has done a fantastic job- I am amazed at the audio clarity and purity of the resulting files.”
Portfolio Highlights:
Polished podcast episodes ready for publishing
ACX-compliant audiobooks optimized for Audible
Restored vintage recordings and interviews
Skills & Tools:
Audio Editing: Adobe Audition, Pro Tools (My first choice, if for any reason you prefer another audio editor please mention that)
Podcast Production: SEO, transcription, social media clips
Audiobook Mastering: ACX compliance
Audio Restoration: Noise reduction, tonal balancing
Audio Forensics: Legal work
About Me:
I’m João, an experienced Audio Editing Specialist based in Lisbon, Portugal. My background in audio engineering and teaching audio production spans over 15 years. I’ve also worked as a radio host, where I honed my skills in storytelling and sound design.
Ready to elevate your audio project? Message me today to get started.
Steps for completing your project
After purchasing the project, send requirements so João can start the project.
Delivery time starts when João receives requirements from you.
João works on your project following the steps below.
Revisions may occur after the delivery date.
Share your audiobook assets with me.
You can either share a Dropbox/Google Drive link, or I can create an exclusive Dropbox folder for you and your audio files.
Audio check
I will make sure the audio is ready to be Mastered by proof listening random sections of your audiobook.