Radio Ad Maker: 30-Second Sponsor Spots for Small Stations

One sponsor script, four versions to send for approval

A sponsor usually wants to hear a choice before the spot goes on air. Here is one 30-second script for a made-up garden shop, read by two voices, and each read built twice with a different bed. That is two voice generations (4 credits) and four finished spots; the extra builds cost nothing.

Made on 21 October 2026 with the same settings the studio uses. Lengths are measured on the downloaded MP3 with ffprobe. Brambleton Garden Supply and Hollowbrook are made up for this example.

How to make a radio ad for a sponsor

1. Get the facts from the sponsor: their name, the one offer or reason to visit, where they are, and any dates or opening hours that must be said on air.
2. Write the script in the sponsor's words, or start from a template, and paste it into the studio. The studio shows an estimated length as you type, at about 13 characters per second.
3. Pick a voice that fits the sponsor and play its sample before you spend a credit.
4. Generate the voice. A script of up to 220 characters is 1 credit and a script of 221 to 900 characters is 2 credits, so a 30-second spot is 2.
5. Choose an intro, a background bed and an outro and build the spot. Build again with other sounds for free until you have two or three versions you like.
6. Download the versions and send them to the sponsor to pick one. If they want different music, rebuild; if they want different words, edit the script and generate the voice again.
7. Download the approved spot as MP3 or WAV and schedule it in your playout software.

Need a script to start from? There are 16 fill-in-the-blank templates for 15, 30 and 60-second spots, sponsor tags and underwriting credits in radio ad script templates.

Which voice fits a radio ad?

The 24 voices are grouped by on-air role. For sponsor spots, these four groups get the most use:

• Corporate & Clear: crisp and even, for banks, clinics, garages, estate agents and anything where the listener has to catch a phone number or an address.
• Warm & Narrator: slower and friendlier, for family businesses, garden centres, restaurants and community events, where the spot should sound like a neighbour's tip.
• Hype & Announcer: big and fast, for sales, grand openings, concerts and game nights.
• Radio & DJ: sounds like one of your presenters, so the spot sits naturally next to your station IDs.

You can also clone a voice from 8 to 30 seconds of speech, for example your breakfast presenter reading the ad, as long as it is your own voice or you have the speaker's permission. A cloned voice reads 10 languages and cannot change speed.

To compare every voice reading the same line, use the radio announcer voice generator.

Which music bed should a radio ad use?

The bed is the music under the voice. JingleLark mixes it for you: it loops the bed to the length of the read and ducks it under the voice with sidechain compression, so the words stay on top without a manual fade.

• Match the sponsor, not the station. A calm ambient or lo-fi bed suits a garden shop or a café; a corporate bed suits services; a rock bed suits a garage or a game-night promotion.
• During Halloween and the holidays, the seasonal templates bring a full set of themed sounds, which suits a sponsor's seasonal sale.
• If a bed fights the voice in a version, try another before rewriting anything: rebuilding is free.
• The intro and outro add their own length on top of the read, about one to two seconds each, so leave room for them when the slot is tight.

Will the script fit a 30-second slot?

There is no length setting: the spot is as long as the script, read at the speed of the voice you pick, plus the intro and outro. The same 361-character script above came out five seconds apart in two voices.

Measured on 21 October 2026 with ffprobe. The studio estimate uses 13 characters per second.

So pick the voice first, then trim or add a line until the finished spot fits the slot you sold. For a 30-second spot, aim for about 390 characters; for a 15-second spot, about 195. A single read can be up to 900 characters, about 70 seconds, which covers a 60-second spot. If a read runs long, most voices can also be sped up to 1.2×.

What does each spot cost to make?

Only the voice uses credits. Prices below are worked out from the one-time credit packs; there is no subscription and purchased credits never expire.

Extra versions for the sponsor cost nothing as long as the words stay the same: the four spots above came from two voice generations, 4 credits, about $1.19 on the Starter pack. New words, or the same words in another voice, mean a new voice generation.

Is this the right tool for your ad?

A good fit

Single-voice spots of up to about 70 seconds for local sponsors, sponsor tags such as a sponsored weather or traffic report, and noncommercial underwriting credits, made by the station in minutes instead of booking voice talent.

Not a good fit

Dialogue ads with two or more characters, sung jingles, and ads you want written for you: JingleLark reads one voice per spot, does not sing, and the words are always yours. For those, a voice-over agency or a jingle house is the right call.

Can you sell the spots you make?

Yes. Spots you download from JingleLark are royalty-free for radio, podcasts, social media and paid ads, with no per-play fees and nothing to renew, so you can charge the sponsor for the airtime and the production. The script stays yours or the sponsor's.

Related pages

For fill-in-the-blank scripts for 15, 30 and 60-second spots, sponsor tags and underwriting: radio ad script templates.

To hear all the voices read the same line before you pick one for a sponsor: the radio announcer voice generator.

If your station is noncommercial, underwriting credits and a full starter set are in community radio jingles.

Once a spot is approved, schedule it: how to add jingles to your playout software.

Radio ad maker FAQ