How do I add sound effects to a video?

Upload the video to Valmera and ask for the sound and the moment in one sentence: "generate a whoosh on the cut at 0:08", "put a deep impact on the word 'never'", "a riser building into the logo reveal". The agent creates the sound from your description, places it at that point of the edited timeline, and mixes it against your speech and music. If you already own the file, upload it and ask for it by name instead — nothing is generated, so it costs less.

Where should sound effects go in a video?

On the moments the viewer already notices, and usually a fraction of a second before the picture changes rather than on it. A whoosh sells a transition, so its peak should land on the cut — which means the file starts a few frames earlier, because a whoosh is mostly attack ramp. An impact punctuates a reveal or a stressed word and lands on that frame. A riser builds tension and has to start about two seconds ahead so it resolves on the change. A click or a tick marks a small mechanical event: a UI action, a counter, a beat. Three to six well-placed accents read as sound design; one on every cut reads as a stock template.

Does Valmera have a sound effects library I can browse?

No. There is no bundled effects pack and nothing to search. Every sound effect in an edit is either generated from a text description you write (0.5 to 22 seconds) or a file you uploaded. In both cases you name the sound and the moment in plain English and the agent places it, so there is no library step in the workflow either way.

Will the AI add sound effects on its own?

No, and that is deliberate. Sound effects in Valmera are strictly opt-in: the agent only places one when your own message asks for it. "Make it punchy" or "make it viral" is not a request for sound effects — it gets you pacing, framing and captions, and an offer of sound design in the reply. An uninvited whoosh is the loudest thing an edit can get wrong, so the agent will not decide for you.

Can I use my own sound effect files?

Yes. Upload the file — a signature sound, something from a pack you bought, a recording you made — and ask for it at the moment it belongs. No generation model runs, so it is among the cheapest edits there is, and the agent still handles the placement and the mix.

How loud are the sound effects, and do they duck under my voice?

Each sound is placed at −6 dB by default relative to its own file, and you can ask for it louder or quieter in plain English. Sound effects deliberately do not duck: an accent that dips under the very word it is punctuating stops being an accent. Music is the layer that ducks, via a sidechain that follows your speech. If a sound effect is fighting your voice, the answer is usually a quieter effect or a different moment, not ducking.

What happens to a sound effect if I cut the video afterwards?

It moves with its footage. Sound effects are content-anchored: the point where you placed one is mapped back through the source, so trimming six seconds out of your intro slides the whoosh six seconds earlier and it stays on the same frame. If the moment it was placed on is cut away entirely, the sound is removed and the agent tells you so, rather than leaving it to fire over unrelated footage. Music, voiceover and overlays behave differently — they are anchored to the program, so they clamp to the new length.

How do I add a whoosh to a transition?

Ask for it on the cut: "generate a soft airy whoosh on the cut at 0:14". Because the timestamp you give is where the file starts and a whoosh is mostly build, ask for it about half a second before the junction if you want the peak exactly on it — or just say "the whoosh is late, move it earlier" after watching the preview, which is a single follow-up message.

Is there a free way to add AI sound effects without a watermark?

Valmera's free plan is 50 credits, granted once at signup with no credit card, which is enough to generate and place real sounds. Free-plan exports carry a small Valmera mark in the corner; on Creator, Pro and Frontier there is no watermark at all. Every export, on every plan, closes with a brief (~2.5-second) Valmera end card after your video.

Add Sound Effects to a Video

A sound effect is a timing decision before it is an audio decision. The hard part was never finding a whoosh — it was putting it on the right frame.

To add a sound effect to a video in Valmera, upload the footage and name the sound and the moment in one sentence: "generate a whoosh on the cut at 0:08", "put a deep impact on the word 'never'", "a riser building into the logo reveal". The AI agent generates the sound from your description — any one-shot between 0.5 and 22 seconds — places it at that point of the edited timeline, and mixes it against your speech and music. If you already own the file, upload it and ask for it by name instead. There is no effects library to browse, because there is nothing to browse: every sound is either described or supplied.

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How to Add Sound Effects to a Video

1
Upload your video
Drag in an MP4, MOV, MKV or WebM up to 3 hours. Valmera analyzes it once with visible progress — a word-level transcript, shot boundaries, silences, and an audio analysis that measures tempo, energy peaks and which words you actually stressed. That analysis is what lets you say "on the strongest word" instead of hunting for a timecode.
2
Name the sound and the moment
Type the whole request as one sentence: "generate a soft airy whoosh on the cut at 0:14", "a deep metallic boom on the title reveal", "a riser building into the drop", "a camera shutter click when the photo appears". The sound is created from your words and placed at that second of the edited program.
3
Watch it, then nudge it
Play the preview and correct in plain English — "the whoosh is late, move it earlier", "make the impact quieter", "lose the riser". Retiming, releveling and removing are each one message; nothing has to be regenerated to move.
4
Export
Export a full-quality H.264 MP4 rendered from your original upload — the sound effects are mixed in at render time, not baked into anything you uploaded.

The analysis runs once per upload. After that, every sound-effect change is a single chat message.

EXAMPLE PROMPTS

"generate a soft airy whoosh on the cut at 0:14"
"put a deep cinematic impact on the word 'never'"
"a riser building into the reveal at 0:42"
"add the whoosh.wav I uploaded on every cut in the intro"
"the boom is too loud and a beat late — quieter, and half a second earlier"

Where Sound Effects Actually Go

Four sounds do almost all the work in an edited video, and each one has a different relationship to the frame it belongs to. Getting that relationship right is most of what separates sound design from sound decoration.

Three sounds, one cut, three different starting points.

A whoosh sells a transition. It is a movement sound, so it is mostly attack ramp with a short tail, and the loudest part is somewhere in the middle. That is why the folk advice is "a few frames before the cut": the timestamp you give is where the file starts, and if the file starts on the cut, the peak arrives after it and the whole thing reads as late. Ask for it about half a second early, or place it on the cut, watch it, and say "the whoosh is late".

An impact punctuates. It has an instant attack and a decaying tail, so it lands on the frame — the logo appearing, the number hitting the screen, the stressed syllable of the line you want remembered. Because Valmera measured which words you actually emphasized during the analysis, "put an impact on the strongest word in that sentence" is a request the agent can answer without you supplying a timecode.

A riser buys anticipation. It only works if it resolves: it should start roughly two seconds before the moment and end on it. A riser that finishes into more talking is a promise the edit does not keep.

A click or tick marks a mechanism. A UI action, a counter ticking, a photo appearing, a beat in the music. These are small on purpose — if you can consciously hear it, it is probably too loud.

The rate matters more than any individual choice. Three to six accents across a two-minute video read as intentional; one on every cut reads as a template, and after about the fourth identical whoosh the viewer stops hearing them as punctuation and starts hearing them as noise. If you want the cuts themselves to feel designed, that is usually a job for a transition style or a punch-in, not for more sound.

How the Placement Works Underneath

Every sound effect in Valmera is one entry in a versioned Edit Decision List: a storage key, a point in time, and a gain. Nothing is mixed into a file until you render, which is why moving a sound is instant and free and why removing one leaves no trace.

The point is expressed in output seconds — the edited program the viewer will watch, not the raw upload. That distinction matters the moment you have already cut something: 0:14 of your edit is not 0:14 of your recording, and a sound placed against the wrong clock lands on the wrong footage. Requests are rejected outright if the time falls outside the program.

But the point does not stay a program time. Sound effects are content-anchored: when a later edit changes the timeline, the point is mapped back through the source and forward into the new program, so the sound follows the frame it was placed on.

Content-anchored, not program-anchored — the difference between a whoosh and a soundtrack.

If the moment a sound was placed on is cut away entirely, the sound is removed and the removal is disclosed in the reply — it is not clamped onto the last surviving frame, and it does not silently drift onto the next take. Music, voiceover and overlays are anchored the other way, to the program, because they cover a span of the edit rather than a moment of the footage; they clamp to the new length instead of chasing content.

At render time each effect becomes a delayed input in a single mix: the file is offset to its point, gained, and summed with the program audio. Three consequences worth knowing. A sound effect never ducks and never loops — it fires once and lasts exactly as long as the file, because an accent that dips under the word it is punctuating is no longer an accent. The default is −6 dB relative to the file you supplied or generated, adjustable per sound by asking. And there is no limiter across the mix, on purpose: a limiter needs a few milliseconds of lookahead, and that lookahead delays the entire program's audio against the picture. Trading a global sync offset for a hypothetical transient is a bad deal, so headroom is handled by the default gain instead. Level the whole thing at the end with a single request to master to −14 LUFS — see loudness targets.

One more thing that is unusual: the agent's reply is verified server-side against the edits actually recorded. "I placed the boom at 0:14" is a checked fact, not a claim — if the placement failed, the reply says so rather than describing an edit that does not exist.

When It Goes Wrong, and What to Do

The sound is right but feels late

Almost always the peak-versus-start problem. The timestamp is where the file begins; ask to move it a few tenths earlier. Retiming does not regenerate anything, so it is instant and cheap: "the whoosh is late, move it 0.4s earlier".

The generated sound is generic

A generator answers the description you wrote. Name the object and its material, the action and its speed, the space (reverb is most of what makes a sound belong in your shot), and how it ends. Change one variable at a time on the retry — "same but drier", "heavier low end", "half as long". The sound effects generator page covers this in detail.

The tail gets cut off at the end of the video

The mix ends when the picture ends, so a sound placed near the finish loses whatever ran past it. You are warned when this will happen. Move it earlier, ask for a shorter sound, or let the closing fade carry it.

You asked for "punchy" and got no sound effects

Intended. Sound effects are strictly opt-in — the agent places one only when your own message asks for one. Vague energy words get you pacing, framing and captions, plus an offer. Ask directly and you will get them.

The sound disappeared after another edit

The frame it was anchored to was cut away, and the reply will have said so. Restore the cut range and re-place the sound, or place it on a moment that survives.

Everything sounds mushy with all the effects in

Usually rate, not level. Cut the number of accents before you cut their volume, and check whether the music and the effects are competing in the same frequency range — a low boom under a bass-heavy track is a mud problem no gain change fixes.

How People Do This Without Valmera

Every route below works, and some are better than Valmera for particular jobs. The common thread is that they all separate finding the sound from placing the sound, and the second half is where the time goes.

Premiere Pro. Drop the file on an audio track, park the playhead on the cut, and nudge in single-frame increments until it locks; the Essential Sound panel gives you SFX-typed presets and level control. Adobe has also been adding generative sound effects to Premiere, so check the release notes for the version you have rather than assuming either way. It is the most complete of these routes and the one with the steepest learning curve, and you are still the one deciding which frame.

DaVinci Resolve. The Fairlight page is a real digital audio workstation attached to your timeline, and Blackmagic offers a royalty-free sound library as a separate download. For anything approaching actual sound design — layering, EQ, reverb matched to the room, Foley — Resolve is a stronger tool than any chat interface, free tier included.

ffmpeg. Two filters do the whole job: adelay to offset the effect to its moment and amix to sum it with the program. It is exact, scriptable, free, and unforgiving: you supply the millisecond, and every revision is a full re-encode. Valmera's renderer builds the same graph — the difference is that you are describing the moment instead of computing it.

CapCut, VEED, Kapwing and the other browser editors. These lead with browsable sound-effect libraries, which is genuinely the fastest path when the sound you want is a common one and you like picking from a list. The trade is that you are still dragging it to a position by hand, and the library is a fixed menu — when nothing in it is right, there is no next step.

Standalone generators and libraries. Text-to-audio tools and stock sites (Freesound, Epidemic Sound, Artlist and friends) will hand you an excellent file. Then you still have to get it into an editor, onto the right frame, and at the right level against the voice. If your workflow already lives in an NLE, this is a perfectly good split; if it does not, the download is the beginning of the work rather than the end of it.

Honest Limits for This Job

There is no library. The bundled effects pack has been withdrawn, so you cannot browse a menu of stock sounds. Everything is described or uploaded. If you specifically want to audition twenty whooshes and pick one, a library-first editor is the better tool.

There is no one-request sound-design pass. You cannot ask for "sound design this video" and get a full set of placements automatically. Each sound is its own request naming its own moment — which is more typing, and also the reason you never end up with accents you did not choose.

Generation makes one-shots, not music. 0.5 to 22 seconds, one event per description; two events in one sentence come back as a blur of both. Valmera has no AI music or song generation at all — for a soundtrack, use the library of 23 CC0 tracks across 8 moods or your own upload. There is also a cap on how many sounds can be generated inside a single turn, so a very long list is better split across a few messages.

No layering controls beyond level and time. You can place, retime, relevel and remove. There is no EQ, no reverb send, no pitch shift and no fade shaping on an individual effect — if you need a sound processed, process it before you upload it. And Valmera does audio mixing, not audio restoration: there is no denoise or "studio sound", so effects will not rescue a bad recording. Muting the original and rebuilding from music, effects and a voiceover sometimes will.

Related Tools

Sound effects are one layer of a mix. The same chat adds music that ducks under speech, a voiceover track, and a mute on the original audio when you are rebuilding the soundtrack from scratch. If your accents are meant to land with the music rather than the picture, beat-synced cuts put the junctions on the measured beat grid first, which makes the sound placements obvious afterwards.

For the describe-a-sound craft specifically — material, action, space, tail — read the AI sound effects generator page. For every audio parameter in one place, the audio and music docs; for the generation side of the editor, AI generation. Everything else lives in the tools hub.