What Are Filter Words in Writing?
Quick answer: What are filter words in writing? Verbs like saw, heard, felt and noticed that report perception instead of rendering it, adding distance. When to cut and keep them.
Filter words are verbs that report a character's perception instead of rendering it directly: saw, heard, felt, noticed, watched, smelled, realised, wondered, knew, seemed, decided. 'She saw the door swing open' filters; 'The door swung open' does not. Each filter inserts the character between the reader and the event, reminding you that someone is perceiving rather than letting you perceive.
They matter because they are the single easiest lever on narrative distance. Cut them and prose instantly moves closer, sharper, more immediate. Keep them where the act of perceiving is itself the point. The skill is not eradication; it is knowing which sentences earn the verb.
Why filters push readers away
Once a viewpoint is established, the reader is already stationed inside the character's senses. Everything on the page is, by contract, what this character perceives. 'He heard footsteps on the stairs' therefore says something the reader knew for free, and spends the sentence's energy on the hearing rather than the footsteps. 'Footsteps on the stairs' delivers the event straight into the reader's own ears.
The cost compounds. One filtered sentence is invisible; a page of saw-heard-felt turns fiction into a perception report, and readers feel the glass between themselves and the scene without knowing why. Editors flag filters so often precisely because the fix is mechanical and the improvement immediate: the same scene, one layer closer.
Before and after, on the page
Filtered: 'She heard the kettle click off and noticed the kitchen had gone quiet. She felt a chill move through her, and she realised the back door was open.' Four perceptions, four filters, and the paragraph is about her nervous system's paperwork.
Unfiltered: 'The kettle clicked off. The kitchen had gone quiet. A chill moved through her: the back door was open.' Same information, same viewpoint, but the events now happen to the reader too. Notice that the revision is not merely deletion; it often demands a slight restaging so the perception's cause takes the stage. This is the routine that produces what craft discussion calls deep POV, and it is the fastest self-editing win most developing writers ever learn.
When filter words earn their keep
Sometimes the perceiving is the story. 'She watched him pack' is not about the packing; it is about her standing there, choosing to watch, unable to speak, and 'watched' carries that paralysis. Keep the filter when the character's attention, effort or reluctance is the actual subject of the sentence.
Filters also do honest work at viewpoint boundaries: establishing whose head a scene occupies in its opening lines, marking the strain of perception ('he could just make out a figure on the ridge'), or signalling doubt ('she thought she heard her name'). And at far narrative distance, in summary or transition, filters are natural furniture. The rule of thumb: filters are tools at the top of the distance ladder and clutter at the bottom.
How to run the edit without wrecking your voice
Do a dedicated pass late in revision. Search for the usual suspects, saw, heard, felt, noticed, watched, realised, wondered, knew, seemed, looked, and interrogate each hit: is the perceiving dramatic here, or is it scaffolding? Rewrite the scaffolding sentences so the perceived thing acts: doors swing, kettles click, chills move.
Beware zealotry. A manuscript scrubbed of every filter can read oddly airless, all events and no experiencer, and some rhythms simply want the verb. 'She felt, for the first time in years, entirely safe' would lose its cadence rewritten around the feeling. Style guides give you the default; your ear gives the verdict. Aim to cut most filters, keep the ones doing character work, and let the survivors mean something because they are rare.
Make the pass systematic rather than heroic. Keep your personal suspect list in a style sheet, since every writer leans on different crutches, and run it as a find-search after structural revision but before proofreading. Log the hits per chapter the first few times; most writers discover two or three chapters, usually early ones drafted before the viewpoint settled, carrying half the total. The numbers turn an abstract style principle into a fifteen-minute maintenance job, and after two or three manuscripts the filters largely stop appearing in your drafts at all.
What poets can take from this
- Run a search-pass for saw, heard, felt, noticed, watched, realised, seemed and knew.
- Rewrite so the perceived thing performs the verb: the door swung, the smoke thickened.
- Keep a filter when the act of attention is itself the drama.
- Use one filter to anchor viewpoint at a scene's opening if needed, then go clean.
- Read the revised scene aloud; if it feels airless, restore the two or three filters your ear misses.
- Keep a personal suspect list in your style sheet and run it as a scheduled pass, not a mood.
Try it yourself
Write a 300-word scene of a character alone in a house at night, hearing an intruder, using as many filter words as feel natural. Then rewrite it with none. Compare which version frightens you, and steal the best sentences from each.
Questions
Are filter words always wrong?
No. They are wrong as habit and right as choice. When the character's act of watching, hearing or realising carries emotional weight, the filter verb is doing real work and should stay.
Do filter words matter in first person?
Just as much. 'I saw the car swerve' filters exactly as 'she saw' does, and cutting to 'The car swerved' pulls the reader into the narrator's eyes. First person establishes the perceiver even more firmly, so the reminders cost even more.
Is 'thought' a filter word?
Thought tags behave like filters: 'She thought he was lying' sits farther than 'He was lying, of course.' Rendering thought as plain narration is the same closeness move, and free indirect discourse is its classic form.
By the Writory editorial team, reviewed by working poets. Updated July 2026.
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