How to ask for a testimonial has one honest answer: directly, from the person who did the work, while the result is fresh, for something small and specific. Everything else is decoration. The reason most businesses have four testimonials from 2023 is not that customers refuse: on the worked example 42% of the people asked answer: it is that only 35% of customers get asked at all, which leaves 78 people a year nobody spoke to.
Ask at the moment it went well
Delivery day, the good result, the renewal, the thank-you email they sent you unprompted. That last one is the easiest ask in business: reply to it and ask if you may use what they just wrote. Asking on the day is not pushy; it is the only moment when both of you remember what actually happened.
Ask for something small
Two sentences, on a link, for a named page. A small specific ask gets said yes to; a large vague one gets postponed and then forgotten. 'Two sentences on what changed, for our services page' is a request somebody answers between meetings. 'Would you write us a testimonial' is a task that goes on a list and stays there until the project is a memory.
Make it a step in the job, not a campaign
The businesses with fifty testimonials do not ask harder, they ask every time. Put the ask at the end of the job the way the invoice is at the end of the job, and the 78 unasked customers on the worked example stop existing.
Questions people ask about how to ask for a testimonial
What if they say no?
Very few do. The ones who cannot are usually constrained by their employer, and they will often agree to be quoted anonymously by industry and role.
Is it unprofessional to ask?
It is normal, and asking after a good result is the least awkward moment there will ever be.
Should I ask for a review instead?
That is a different thing on somebody else's platform, and this hub is only about the testimonial you are given.