ドット絵メーカーの使い方：ブラウザで無料作成＋AI コマンド活用（128×128 メカ JSON 付き）

ドット絵メーカーは、ブラウザだけで使える無料のドット絵ツールです。インストールや会員登録は不要で、描いた作品がサーバーにアップロードされることもありません。この記事では、基本的な描き方と「AI コマンド」タブを使ってチャットボットにドット絵を作ってもらう手順、128×128 の大きな作品を作ったときに気づいた注意点をまとめました。最後に、そのまま貼り付けて使えるサンプル JSON も掲載しています。

基本の描き方

1. ドット絵メーカーを開き、「新しい空白キャンバス」からサイズを選びます（8×8・16×16・32×32・64×64）。
2. 色を選び、「描く」「消す」「塗りつぶし」「スポイト」の各ツールで描きます。
3. 「左右ミラー」にチェックを入れると、片側に描いた内容が反対側にも自動で反映されます。キャラクターやロボットなど左右対称の絵に便利です。
4. 間違えたときは「元に戻す」「やり直す」を使います。最初から描き直したいときは「すべて消去」を押します。
5. 完成したら書き出し倍率（1×（等倍）・×8・×16・×32）を選び、「PNG をダウンロード」を押します。背景は透過になります。

「AI コマンド」タブでチャットボットに描いてもらう

このサイトに AI は内蔵されていません。「AI コマンド」タブのプロンプトを、普段お使いのチャットボットに貼り付けて使います。

1. 作りたい内容を書き、プロンプトをコピーします。
2. チャットボットに貼り付け、描いてほしいものとサイズを伝えます。
3. チャットボットの答え（JSON）をコピーし、手順 3「チャットボットの答えを貼り付け」に貼り付けます。
4. 「チェック」→「プレビュー」で確認し、問題なければ「適用」を押します。その後も手作業で編集・書き出しができます。

実際に使ってわかったコツ

• 形式のルールは厳密です。pixels の行数は高さと同じ、各行の文字数は幅と同じでなければなりません。128×128 なら、ちょうど 128 行・各行ちょうど 128 文字です。1 文字でもずれると読み込めません。
• チャットボットは大きなマス目になると、行の長さを数え間違えることがよくあります。まずは 32×32 や 64×64 から試すのがおすすめです。大きな作品を作りたい場合は、チャットボットに Python で画像をドットデータに変換させ、各行の長さもプログラムで確認してもらうと確実です。
• 新しい JSON を貼り付ける前に、貼り付け欄の「クリア」を押しておきましょう。前の内容と混ざるのを防げます。
• 「.」は透明を表します。背景を「.」にすると、透過 PNG として書き出せます。
• パレットは最大 32 色、サイズは最大 128×128 です。

サンプル：128×128 赤と金のカブトムシ型メカ JSON

このメカは私のオリジナルデザインです。下の JSON は、自分で描いた画像から変換プログラムで生成したもので、1 マスずつ手で打ち込んだものでも、チャットボットが書いたものでもありません。

ご自由にお使いください。最初の「{」から最後の「}」までをすべてコピーし、「AI コマンド」タブの手順 3 に貼り付けて「プレビュー」→「適用」を押すと、キャンバス上で編集して PNG に書き出せます。長いため、ページ上では数段落に分かれて表示されますが、まとめてコピーして貼り付ければそのまま使えます。

{ "version": 1, "width": 128, "height": 128, "palette": [ "#050609", "#0c0709", "#1d1e25", "#3d2511", "#3b3b3f", "#1f2027", "#372a47", "#793665", "#505054", "#858384", "#d5d3cf", "#281d15", "#573512", "#8a571a", "#9b784f", "#bb7f2e", "#eda942", "#f2c779", "#e8d4b3", "#241112", "#4b1a15", "#60303f", "#76291e", "#a4392b", "#8a5a44", "#dd704f", "#f0b7a5", "#3e6051", "#2a6533", "#3ba05b", "#4ce193", "#81e4ad" ], "pixels": [ "................................................................................................................................", "................................................................................................................................", "...................................0............................................................................................", ".............................00...0g0...........................................................................................", "............................0gg0.0gf0..000000...................................................................................", "...........................0ggf00ggf000ggggff0..................................................................................", "...........................0ggf00ggf0ggggffffd0.................................................................................", "..........................0gggf0gggffggfffddd0..................................................................................", "..........................0gggf0gggfffffddd00...................................................................................", "..........................0gggf0ggffffddd00.....................................................................................", "..........................0hhf44ggggdccb0.......................................................................................", "..........................0ghgffgggdccb0........................................................................................", "..........................0gghiiggdccc0.........................................................................................", "..........................0cgggigfdccc0....................0000.................................................................", "...........................0cggigfddd0...................00gggg00...............................................................", "............................033igfddd0..................0ggggggff0..............................................................", ".............................03ggfdddc0........0.........00gggfff0..............................................................", "..............................03hgdddc0.......090..........0bfhffd0.............................................................", "..............................03hgfddd0......09d0...........0bghd220............................................................", "...............................0cgfdddd0.....0hd40...........03ggdd0............................................................", "...............................0cgfdddd0....0ohd40...........03ggdd80...........................................................", "................................0hgddddk0...0ogd40...........03gggd80...........................................................", "................................0hhgddkmk0..0egde0............0ghgdo0...........................................................", ".................................0hgddkkm0..0egded0.00000000..0ghhdoc0..........................................................", ".................................0hhgddmmm001ggffd101111111100dhghddc0..........................................................", "..................................0hgdddknc01ggffd11nppnnnn110dgggcc60..........................................................", "..................................0hggddkknc1gffd1pppnnnnnm11dhggcc460..........000000000.......................................", "...................................0hgdddkknn1gffgg1npnnnmk1dhgggcc40........000llooooo44000....................................", "...................................0egfddckkn1ffgggg1nnnnmk1ggggcco40......00mhhffqqqqqpppoo000.................................", "....................................0egfddckmm1fgggggf1nmkk1ggdcco40......0mmjjjfhhdaaaqpppppnk00...............................",

"....................................08ggdddk1mm1ggggffff1mk5ddcdo40.......0m111111aadaaaqqppnnnkl0..............................", ".....................................08gfdddf1m1ffffddddd15511111mk0.....0mmjjj1111aadqqqqppnnnmnl00............................", "......................................0fgfddff1dd111111tuu11knmkkkmk0....0mjjjjjj111ahgppppppnnnmml60...........................", ".......................................0fgfdfdd15555tuvvut1nknnmkkkmk0...0mjjj1111111hgnnnnnnnnnmmm760..........................", "..................................0000..0egffddd15tuvvut1g1n11nmkkkkmm0..0mjjjffffd111hgnnnnnnnnnnkm760.........................", "...............................000ccck00.0egddd1tut11111gf1n81nmmmkkkmm000jhhgggggfdd11hgnnnnnnnnnmkm760........................", ".............................00qffhhkkkl0.0ed1111aaaa1ggf1n181kkk11111mkkhhhaiigggggdd1dggnnnnnnnnnkmm760.......................", "...........................00aqqfh11111kl0.0n1u19aaa91gfd1nnjj1111bb122khiaaaaaig331ccd1hgmnnnnnnnnmkmk70.......................", "..........................08aaphh111jjj1ll001n15599951fdd15511ihhhdccc2qiiigggie1111111d1hgmnnnnnnnmkkk770......................", ".........................08aaphh1111jjjjkl001n155111551dd1554iiiddbkk21qiggggge11422111111ggmnnnnnnmkkkk770.....................", "........................08aaphh111jjjjkkkl6001f11bbb11111224gffffb55211ggggggge14a421511c1ggcnnmnnnnmkkkk70.....................", ".......................08aqpehe11jj111bbjjl601f111b11199982egfiif545111ggggggg119a445221c11ggcmnnnnmmkkkk710....................", "......................08qqpnhe11j1199911bl1l611iipppppmm182ehiii3541588ggggggd1999844251c11hggnnnnmmmkkkkk710...................", "......................0oqpnhh111dhaggieb1111paqqpnnnnnmmm11hhggf3455582ggggggd1499824521c1j1hgmmnnmmmkkkkk7l0...................", ".....................0oppndhd11dhaaaiej11gcpaqnnnnnnnnmkkmmhgggf3525582gefggd149111222cjjjb13hgggmmmnmkkkkl70...................", ".....................0ppnnhd11dhaiiaaj12g1ceeennnnnnnmmkkkggcddd3525185egfbb155111112hcccb3b13ggggmmnmkkkkk7l0..................", "....................0npnnhh111hhggggc12hgiiggggnnnnnmkkkkmkffcc114215551eb155515aa52ghc5bb3b311bggggmmkkkkkl70..................", "....................0pnneh111hihggggc15hegeggggnnnnmkkkkkdm1c111844111111115118aaaa55gg55c33333b13gggfkkkkkk770.................", "...................0npnmhe111higggggb5fpegdeggcnnnmkkkkkdmmk114488551111111118aaaaa51ggd5c1333333113ggfkkkkk770.................", "...................0pnmfh111132fggegb2fpdgdgggcnmmkkkkkdd3mk111484451111111118aaaaaa51dgdd1333333b3b1fgfdkdkk70.................", "..................0kpnfh111jj3b2fgegb2fmdghgffcmmkkkknn33311ppk244555111116jj19aaaaa8513313bb3cc33b3313ffdkkk760................", "..................0knnhf11j3j1b811eb12kmkghfffdmkkkkn11111hhrpkk2225555116633j89aaa888522311nk3ccc33c311fffkk760................", "..................0nngf11jkk33118811111kkkggfddkkkkk11tt21hrddkk1122555566b333j8aa811182213pnkclccccccc113fdkk70................", "..................0ncg11jkk331e1aa888111k1ggfddkkkk1tvv521ffkkkkkk11255661b333318811411841opnmflcccccccc113fdk70................", ".................0jngc1jk33314e1aaaa84111kkffddkkk1tv551121kjkkkk3kk126613cbcc331844881841oennmflcccccccc113fd720...............", ".................0jgg1jk3c344eoaaaa884111pkffdddkk1rr4144111j1113kklkk22333cccccc118881541eonnmkckcccccddc11jd720...............", ".................0mgk133c1004eoaaaa844481pk1gdddkk144114541441111klkkl333ccccccccc18445154ennnmkk7cccccddejj11d20...............", ".................0mg1kc310nk1111149444860kk1egddd188221451494521221bll1ccccccccccc9225511pnnnnkcc7kcdcceeedj1k120...............", ".................0gc1c309nnk111441944860.0111egd41442115119a25522111b001ccdcccddd191211igpnpnnkc1kkdddcedde1kk620...............", ".................0g1c309qnk184914188480...0018111411251519a92211211000001cddddddd1n112igmnppnnm88163eecceeee1jk60...............", ".................0gc304qnn188449811120.....08188844f12515a92mmpmmk1kkjj000cdddddd1nniigggmpnnnmk9163deeceeeeejkl0...............", ".................0c304qnnm111545188210...008811122hfn11159npmpaak5ppjel70.0ccdddd1nnhiiggmnnmmnk9411deeeceeeejkml0..............", "..................000qpnnmdd511518821k000m2951881hfmmn1mppnpqaqqk51pjfel70.00cddd1nnnhaggfnmhfnn4116deeeceeeeejml0..............",

"...................08pnnmdhae5511112k66epm291511hgdmm1mmnnnqqkkkk1chneffl70..00dddnnnfaggfnhhfg118416eeeeceeeecknl0.............", "..................08qnnnmfahgeennk1kk6eapppii1hhgfdkk1mnnnookk111chcnmkfc770...0ccknnfigggndhgff18421eeeeceeeecknl0.............", "..................0qnnnmfgagfnnnkkkklkaaanmgghggfdkk11mnnnokjc1151ggmnmkck770...00knnngigfgdhhggf15261eeeedeeeeknn0.............", ".................09qknnmgagfnnnkkkjklnnnanm1ghfffmmk1mnnnnkjcg11514hgnnmkkk70....0nknmgigfd1ddhgfd2561eeeedeeeeennk0............", ".................09idkmgaggfnnkkkkjjpn1kmmn1ghfffmkk1nnnnnnnhg15841hgmnnmkkk60...0mmmgg91112113ddfd261eeeeeeeeefnnk0............", "................09idkkkhagfnnmkkkkjpp11nknm1ghffnkk11pnnnnnnoh18851ghfmfmkkk760..0mmjg1198882113dfde1eeeeeeeeeeffnn0............", "...............09ggf1khahgmnmkkkklkpp1ennnm1phffnkk11pnnmnnogg189552hgfmmmkkk70...0jcc1198412211chde1beeeeeehhefhnnj0...........", "...............0dgff1118ggdmkkkkllnp11ennnm1pfnnnkk11pnnnmfgg218a942hgggfmkkk770...01c1111412111chde80beeeeeehhehnnj0...........", "..............0egd11188111gdkkkkllni1hennmf1ppnnnck12dnnoggf2219aa8411gggffkkk70....01119994e5511hfe80004eeeehhfhhnm0...........", "..............0eg3118998821dokkl6nin1hgnnmf1ppnnnc122dnogg31549aaa8845115fffkk770...0898198ee5121hfo80..04eeehhfhhnm0...........", "..............0ge31111114421obl62ng11bhgnee1mfmnkk11efogg31549aaaaa88455111fddk70..04988188he882233o80...001ehhhhhmn10..........", ".............0cgcc1i88111121b962dg11babggdd1mfmnn122efgg114449aaaaa888455111ddd730.04422598he188411o80.....01ehhhhhn10..........", ".............0cfcc1i814881121920fd11aa8bggd11fmnj122eggd11449aaaaaaa884551jjbcde30049411589heeb5451o0.......00ehhhhn10..........", ".............0cfc1i8814882122200fjjjaaa8gg351nfnj222egd111148aaaaaaa844555b33bce9004941118eecedb5650..........0bhhhnk0..........", "..............0c0ci881189222000efjk1a9aa9g345nnn2122eg22111888aaaa9811pppm5b3c3c980441101411coodb60............0bhhfk0..........", "...............00c9881189160..0efckaaa999g3445n24111ee12211888aaa9111ipgfkm6b3ccc8004111894113ooo80.............0bhfk0..........", "................091111188160..0ccc1aaa999334454423b1b1jjj1jj889aa819niipgfkm6003c80018119821113eo80..............0bfk0..........", "...............0224411812120...0c02a29aa8444448213bbbj111jll1889a819nnagggfk70.0330.088882125123e80...............00k0..........", "...............0114848812210..00002222998884448133333331jklll188a821pnaaggfkk70000..01221155121110..................0...........", "................01248421120..0ehha21829988188960bc3333331kklll188925pnnagggkk7440....0112551251120..............................", ".................0212211120.0eggaen811298181960.0bccccc313k77l149955pnndgggdkk7450....00111252220...............................", "..................01222110.0eggiekn582198bb440...0bccccc313777004151pnndgggdkk7j500.....01112200................................", "...................021120..0hgiikmn25211111150....0bccccc333770.0111ppnngdcckk7j5jj0.....00000..................................", "....................0000..0ehhimkmkk222241cb150....00bcccc3c77600441nnnndckkkk7c1jkk00..........................................", "..........................0egghkmmkk12244hccbl50.....0bccccc7760e8e2nnnnmdkkkk7ce1nkk60.........................................", "..........................0gggfkmkkk1224fh52c1l50.....00ccccc7608e82cenmmdkkkk7ce1nnnl60........................................", "..........................0gfffkkkkm1121df25d1k70.......000ccc60beb1ecmmddkkkklde1nnnkl60.......................................", "..........................0gdfcjkkkkm111bddd1kkk70.........0000.0b11ghckmmkkkkldormnnmkl0.......................................", "..........................0gdfcj3dkkkdfb1b111kkkk70............0bpn1nghdkmmkkk1govrmmkkk60......................................", "..........................0gdfd3d3dkbfdoopnkkkkkk70............0nppn1gghdkmkkk1gdvrkkkkkk60.....................................", "..........................0dddd333jbfdd1pnmkkk3kkk70...........0nppm11dghkmkk11gdvvjkkkkk70.....................................", "..........................0dfffkkj1fddd1nnmkkkk3kk70...........0nnnm11vdghm11kggdovjkkkkk760....................................", "...........................0fdf3k11fdds1nmkkkkkckk70...........0nnnnk1uvgghggggddov1jklkkk60....................................",

"...........................0ddfd32dfdvs1mmkkkkkcck760..........0nnnnk11utgho1111dov11kl3dk70....................................", "...........................0dddd22fdvvu1mmkkkkkcd3k60..........0nnnmk14rtggo11212fo151l3dk70....................................", "............................011122fdtud1kkkkkkkcd3k60..........0mnmkk144rtgg18221fo5551ccd720...................................", "............................05552efdtudd1kkkkkkcddk70...........0mkkk11818gg18888241555oooo20...................................", ".............................0eeeffdttdc1kkkkkkdeek70...........0kkkk11481ff899884215565boe80...................................", ".............................0e33ffdddc122jkkkkddek70............0kkk1148411aa8884f515660be80...................................", ".............................03111gddc12221jkjjdeec70............0jkkk118441a9fffgfgfd5620080...................................", ".............................08341gdd12521j11jlceec70.............0jkk1188819aggfggfgdff2200....................................", ".............................08481cc1252221600llceo70..............00kk18441gaaggggfgfdff20.....................................", "..........................000048e141254222260.0lceo60................011184ggaaggggfggddff200...................................", ".........................09fhhie14244455222660.01eo60.................00184gggaaggggggfdfgddd0..................................", "........................09hfghiggb244552221660001ee0...................081egggaagghhffffdggcfc0.................................", ".......................09hfghhgfffb2455992111d600ee0...................091egggaaag111111ddgfcf0.................................", "......................0igggiigfffgfb218912fffd60.00....................091gggghh1111111113ffcoo0................................", ".....................0igggiigfffgdffb18812hfcdd20.....................0111ggggh111555555113fdco0................................", "....................0ccjjjbgggffdfddfb221dhc52d20....................0eh1ddggh11144448445113dooo0...............................", ".....................0c1111bggfffdddffb21dg252d20...................01eh1dggg311199888884221cdco0...............................", ".....................0c554411gfdfddddf311dgd22f1l0..................01ehd1ffg3114498818822211cdo80..............................", "...................00089995211ffdfdddd3111dgdf11l20.................01fgd1ggf1114498bb11bb1211cd80..............................", ".................00bbb899255211fffdddd11111dd11kk720................01fgc1fgc1h1419hgffdfffk111dd0..............................", "................0eggignn2252efc1fdddd115221111kkk720.................0ffc11f1chm1nhaggffdffk711110..............................", "...............0eghignkkkkjeffdc111d1152221nkkkkkk720................0dfc1111ffhmnhaggffdffkk71j0...............................", "..............0eghigkkkkmmmjddcck111111221knkkkkkk720................0kd114418fmnnniiggfffffk7j1l0..............................", ".............0eegickkkkkkkkk11kkmkk1111111nkkkkkkkk70.................0k1122488nnnniagggdddfkk71l10.............................", "............0echhckkkkkkkkkkk1mmkkkk111111nkkkkk3kk760................0nk121nnmnmnnnaggd111kmkk71l0.............................", "...........0ecehfkkkmkkkkkkkk1kkkkk11111111jjjjj333k60...............0nnm112nmmnmnnnihg11511mmk71110............................", "...........0e3hfkmmmkkkkkkkkjj11110000000000000000000................0nnmj1nnknnnnnnihc15451mnkkk110............................", "..........033efkmmm000000000000000....................................0nj11nnknnnnnnhic154451mnk7110............................", "...........00000000....................................................00000000nnnnnni2254455mnkk70.............................", "...............................................................................0000nni11111111mnkk0.............................", "...................................................................................000000000000000..............................", "................................................................................................................................" ] }

ぜひドット絵メーカーで、16×16 や 32×32 の小さな作品から試してみてください。